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—Must I finish the work today?

—No, you    .

A．can’t            B．mustn’t          C．needn’t         D．don’t

—Must I come back before supper, mum?

—No, you       .

You needn't send for the doctor. I'm all right now.

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Don't worry．It's nothing serious at all and you _________ take any medicine．

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

Must I clean the house today？

No, you________.

[　　]