— Must we finish all the exercises today? — No you .You can finish them within two days.A

问题补充：

— Must we finish all the exercises today?

— No, you .You can finish them within two days.

A. mustn’t

B. needn’t to

C. needn’t

D. don’t have

答案：

A. mustn’t

B. needn’t to

(答案→)C. needn’t

D. don’t have

解析：句意：我们必须今天完成所有的练习吗？must的否定回答不用mustn’t，一般要借助于needn’t或者don’t have to。通过分析只有选项符合要求，故选C。