-Must I send my uncle an e-mail now Dad? -No you .You do that after you finish your hom

问题补充：

-Must I send my uncle an e-mail now, Dad?

-No, you .You do that after you finish your homework.

A. couldn’t; may

B. can’t; can

C. needn’t; can

D. may not; must

答案：

A. couldn’t; may

B. can’t; can

(答案→)C. needn’t; can

D. may not; must

解析：句意：---爸爸，我必须现在发给我我叔叔电子邮件吗？---不，你不必了，你可以在完成作业之后再做。对于must引导的一般疑问句作否定回答要用needn’t，结合语境故选C.