Mum,may i go out to play ? -No,you ( ) .you must finish your homework first如何回答
A.may not B.mustn't C.couldn't D.needn't
参考答案选B，我觉得有问题
人气：147 ℃ 时间：2019-08-22 03:34:44
解答
No, you mustn't 选 B . may的否定回答用mustn't 和can't. 这里couldn't是过去时
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