问题

We ___ use mobile phones when the plane takes off.
A:may not
B:shouldn’t
C:needn’t
D:mustn’t;
B:shouldn’t
C:needn’t
D:mustn’t;
正确答案是:
同类题型
Good teachers can usually give the students______ advice on their study.
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I think Running Man is the most popular TV game show now.— _______.
My life is a lot easier at high school because my students have accepted me.