18、—Have you finished your homework，Adson?

—No，not yet．

—Then you ________ go out to play basketball．You must finish your homework first．

A．can't             B．mustn't            C．must                D．needn't

18、B

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—Have you finished your homework，Adson?

—No，not yet．

—Then you ________ go out to play basketball．You must finish your homework first．

A．can't             B．mustn't            C．must                D．needn't

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