You can’t watch TVyou finish your homework.A. beforeB. ifC. whileD. as

问题补充：

You can’t watch TVyou finish your homework.

A. before

B. if

C. while

D. as

答案：

(答案→)A. before

B. if

C. while

D. as

解析：考查连词。before在……之前，句意：完成家庭作业之前你不能看电视。选A。