— John you go out to play until your homework .—OK Mum.A. must; finishesB. can’t; is fin

问题补充：

— John, you go out to play until your homework .

—OK, Mum.

A. must; finishes

B. can’t; is finished

C. can’t; has finished

D. needn’t; finishes

答案：

A. must; finishes

(答案→)B. can’t; is finished

C. can’t; has finished

D. needn’t; finishes

解析：考查情态动词和动词被动语态的用法。该句使用了not…until结构，意思是：直到你完成了作业，才能出去玩。第一空用can’t表示“不能”； homework是finish动作的承受者，它做主语时，用被动语态；此处是状语从句，用一般现在时表示将来。