—Morn must I clean my room now?—No you. You can do it in the afternoon.A. mustntB. need

问题补充：

—Morn, must I clean my room now?

—No, you. You can do it in the afternoon.

A. mustn

B. needn

C. can

D. don

答案：

A. mustn

(答案→)B. needn

C. can

D. don

解析：A. mustn 禁止 B. needn 没有必要C.can 不可能 D. don 不；句意：妈妈，我必须现在整理我的房间吗？不，不用。你可以下午整理。故选B