问题

It ___ be the postman at thedoor. It’s only six o’clock.

A:mustn’t
B:can’t
C:won’t
D:needn’t

正确答案是：

同类题型

She didn’t pass the exams becauseshe________ her lessons well.

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Excuse me. Do you know _____________—Yes. He came here yesterday.

Did you enjoy the match—Oh, no.When I got there，the match ______ for a quarter.

Be careful with the knife, ______ you’ll be hurt.