问题
选择题
You _______ make any noise while father is sleeping.[ ]
A. oughtn't
B. mustn't
C. ought to mot
D. didn't have to
答案
答案：B
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You _______ make any noise while father is sleeping.[ ]
A. oughtn't
B. mustn't
C. ought to mot
D. didn't have to
答案：B