Question

－May I do the homework tomorrow?

－No, you ________．You should hand in before class tomorrow．

[　　]

A．

mustn't

B．

needn't

C．

couldn't

Answer 1

答案：A
解析：

考查情态动词。mustn't表示禁止，不准。Needn’t不必；couldn’t不能(过去)。