4、--May I go out and play this afternoon?

--No, you         .Work comes first.

A、needn't                B、mustn't                 C、won't                     D、don't

4、B

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--May I go out and play this afternoon?

--No, you         .Work comes first.

A、needn't                B、mustn't                 C、won't                     D、don't

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