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---Tom hurt his left leg in the game this morning.

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---Tom hurt his left leg in the game this morning.
---Really? It would take at least two weeks ______ he could recover and return to school.
A.when B.that C.since D.before
---Tom hurt his left leg in the game this morning.
D

考查连词before的用法,before在什么之前,才,就,句意:今天上午汤姆在比赛中上了左腿,真的吗?要花至少两周的时间他才能恢复回到学校。所以选D。