—Mom, can I go out and play with my friends now?
—No, honey, you can’t _____ you haven’t recovered from the knee injury.
A．untilB．beforeC．a(chǎn)sD．unless
C

試題分析：句意：--媽媽我現(xiàn)在能和朋友出去玩嗎？--不，親愛的你不能，因為你的膝蓋的傷還沒有恢復。As這里表示“因為，既然”，A. until直到，B. before 在…前面，D. unless除非，所以選C。
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