题目内容

Nothing can be done _______  he returns.
A．asB．beforeC．whileD．until
D

试题分析：句意：什么都不能做直到他回来。A作为B在...之前C当.....时候D直到。Nothing否定词，什么都没有。before 引导的从句中谓语动词不用否定式。此处相当与not ...until直到....才。。故选D.
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