题目内容
【题目】Few students can understand the sentence until it _____ twice or three times.
A. explains B. is explained C. will be explained D. has explained
【答案】B
【解析】句意:直到那个句子被解释了两三次后,学生才能理解它。until引导的时间状语从句用一般现在时表示一般将来时,结合句意,那个句子被解释,故此处用一般现在时的被动语态,故选B。
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