He said it would be at least three more months he could recover and return to school.A. w

问题补充：

He said it would be at least three more months he could recover and return to school.

A. when

B. before

C. since

D. after

答案：

A. when

(答案→)B. before

C. since

D. after

解析：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。

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