问题

You _____ make any noise while father is sleeping.
A:oughtn’t
B:mustn’t
C:ought to not
D:don’t have to
B:mustn’t
C:ought to not
D:don’t have to
正确答案是:
同类题型
Clover, why didn’t you attend the meeting yesterday? —I ____, but something unexpected happened
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One should stick to ______one has begun.
1—Is that Lucy’s cousin,Anna—No, it ______her. She has gone to Paris.