At one point, it seemed certain that their plane would crash. It could only get over the mountains if it rose to 10,000 feet. (New Concept English, Book 2, L.43) 不知 only 是说明哪个成分的？
见 only 。
only then(位于句首)
Only then he became aware of the fact that there were more difficulties ahead than he had expected. (TOEFL)
我已知道 B 是错误的, 因为当 only + 状语位于句首时, 应实行主谓倒装, 即状语 + 助动词 + 主语 + 实义动词。但是, 这里没有助动词, 如何来实现这种部分倒装呢?
当句中无 be, have, should, would, can, could, may, might 等助动词时，需要借助于 do (does, did) 这个助动词来实现部分倒装。
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Only when a child grows up does he understand his parents' intentions. (IME) 只有当儿童长大时,才会理解父母的意图。
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The pilot reassured the passengers. Only then did I realize how dangerous the situation had been. (LEG) 飞行员让乘客放心。只有在那时我才意识到情况曾是多么危险。
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Only in this way is it possible to explain their actions. (CGEL) 唯有如此才能解释他们的行为。
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... and only on one occasion have I ever felt frightened. (New Concept English, Book 2, L.79) ……只有一次我感到害怕。
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Only in a sparsely-populated rural community is it possible to disregard it. (New Concept English, Book 3, L.60) 只有在人口稀少的农村地区才可忽视它。
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Only when he saw that the man was actually telephoning the police did he realize that they had all been the victims of a hoax. (New Concept English, Book 3, L.40) 当他看到这位工人确实在给警察局打电话时，才意识到他们都成了一场恶作剧的受害者。
请做下面的英语试题：
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Only gradually they did incorporate into their preaching the earthly Jesus who had ministered to the people of Israel. (TOEFL)
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Only in the spring ____. A. the flowers do bloom B. do the flowers bloom C. the flowers bloom D. bloom the flowers(TOEFL)
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Only in recent years ____ begun to realize that wild dogs, kept within bounds, often do more good than harm. A. people have B. since people have C. have people D. people who have (TOEFL)
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Only when you have obtained sufficient data you can come to a sound conclusion. A B C D
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____ begun to understand that the air and the oceans act as a single fluid when they exchange heat and gases. A. In the past decade have only meteorologists B. Only in the past decade have meteorologists C. The only meteorologists in the past decade D. Only in the past decade meteorologists(TOEFL)
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Only in this way ____ to make improvement in the operating system. A. you can hope B. you did hope C. can you hope D. did you hope(上海高考,03春-39)
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Only by shouting at the top of his voice ____. A. was he able to make himself hear B. he was able to make himself hear C. he was able to make himself heard D. was he able to make himself heard(全国四级)
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Only under special circumstances ____ to take make-up tests. A. are freshmen permitted B. freshmen are permitted C. permitted are freshmen D. are permitted freshmen(全国四级,97.6-43)