— we go to help him with his work?—No you needn’t. He finish it all by himself.A. Must;

问题补充：

— we go to help him with his work?

—No, you needn’t. He finish it all by himself.

A. Must; can’t B. May; can C. Must; can

答案：

解析：must表示“必须”，用must提问时，其否定回答用needn’t。can表示“可以，能够”。