问题
选择题
There is no night on. They _____ be at home. [ ]
A. can't
B. mustn't
C. needn't
D. shouldn't
答案
答案：A
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There is no night on. They _____ be at home. [ ]
A. can't
B. mustn't
C. needn't
D. shouldn't
答案：A
。
， 。