--Must I clean the room now? --No you .A. can' tB. may notC. mustn' tD. needn' t

问题补充：

--Must I clean the room now? --No, you .

A. can t

B. may not

C. mustn t

D. needn t

答案：

A. can t

B. may not

C. mustn t

(答案→)D. needn t

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