Nothing can be done _______  he returns.
A．a(chǎn)sB．beforeC．whileD．until
D

試題分析：句意：什么都不能做直到他回來。A作為B在...之前C當(dāng).....時候D直到。Nothing否定詞，什么都沒有。before 引導(dǎo)的從句中謂語動詞不用否定式。此處相當(dāng)與not ...until直到....才。。故選D.
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