题目内容

He said it would be at least three more months ________ he could recover and return to school.
A．whenB．beforeC．sinceD．after
B

试题分析：考查固定句式。要抓住before在…之前的根本意义。本句考查了before的句式“一段时间以后某事才发生”；使用It be 一段时间 before…一段时间以后某事才发生；该句式主要考查时态，如果before后面使用一般现在时，前面的主语使用将来时；如果before后面使用一般过去时，前面也使用一般过去时；
本题符合该用法。
点评：考查固定句式：It be 一段时间 before…一段时间以后某事才发生；如果before后面使用一般现在时，前面的主语使用将来时；如果before后面使用一般过去时，前面也使用一般过去时；
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