题目内容
You can certainly leave the classroom as soon as your homework__________.?
| A.has done |
| B.has been done? |
| C.will be done |
| D.will have been done |
B?
在时间状语从句中可以用现在完成时表示将来,强调从句的动作发生在主句谓语所表示动作之前。?
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