问题 选择题

From time to time a crocodile has snatched someone _______ he or she is even aware that the crocodile is there.

A.when

B.until

C.since

D.before

答案

答案:D

考查时间状语从句。句意“有时候,在人们意识到有鳄鱼之前,鳄鱼会突然捉住他。”A“当”;B“直到”;C“自从”;D“在......之前”。故选D。

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