题目内容
You have to stay behind if your homework before five o'clock.
| A．wasn’t done | B．hasn’t done |
| C．doesn't do | D．isn't done |
D
试题分析：句意：如果你在五点前没有完成做业，你必须留下。stay behind留下；homework作业，只能被做，应为被动语态；根据have to可知为一般现在时 ，故选D.
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