问题
选择题
---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
答案
答案：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。