核心问题
except 除了后接名词、代词、动词不定式之外,能否后接状语从句?
词典解答
except 可以后接状语从句。例如：
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He's a good husband except when he's in drink. 他在不喝醉的时候是个好丈夫。
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I usually go to work by bike except when it rains. 除下雨的时候之外,我通常骑自行车上班。
此外,except 还可后接介词短语:
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He cannot spare any time except on Sunday. 除星期天外,他抽不出时间。
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We rarely went anywhere except to his office. 除他的办公室外,我们很少去其他地方。