I( we ) think 用作插入句
He made another wonderful discovery, ____ of great importance to science.
A. which I think is B. which I think it is
C. which I think it D. I think which is(上海高考,98-21)
答案为 A。但是对于 which I think is of great importance to science 的结构我怎么也看不明白。
I think 是个插入句。插入句可以插入到一个语法结构业已完整的句子里去。它的语义特点是: 对句子的内容作一些附加说明。它的语法特点是: 把它去掉之后, 句子的结构和语义都是完整的。拿上面的句子来说, 去掉 I think 之后句子仍是完整的:
He made another wonderful discovery, which is of great importance to science. 再如：
Marie looked at Sophie. ‘We knew we had to protect our grandchildren, and we did what we thought was best.’ (Dan Brown, The Da Vinci Code) 玛丽注视着索菲说：“但我们知道，
我们必须保护好孙子孙女，于是采取了自认为最可靠的办法。”（《达·芬奇密码》）常常用于插入句的动词还有 suppose, know, hope, believe, guess, find, say。插入句是各类标准化英语考试的常考题型，应熟练掌握(参见 parenthesis)。
请做下面的英语试题：
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The pen I ____ I ____ is on my desk, right under my nose. A. think, lost B. thought, had lost C. think, had lost D. thought, have lost(全国高考,93-36)
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As teachers we should concern ourselves with what is said, not what we think ____. A. ought to be said B. must say C. have to be said D. need to say
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Sometimes we are asked ____ we think the likely result of an action will be. A. if B. that C. what D. whether(全国高教自考,94-30)
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The physicist has made a discovery, ____ of great importance to the progress of science and technology. A. I think which is B. that I think is C. which I think is D. which I think it is(全国英语专业四级,97-45)