21．A．mustn't B．couldn't C．needn't D．shouldn't——青夏教育精英家教网—

摘要：21．A．mustn't B．couldn't C．needn't D．shouldn't

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—Must I finish my home work today?

—No, you _____. You may finish it tomorrow.

A．mustn’t B．shouldn’t C．needn’t D．couldn’t

Though he explained it carefully, I ________ understand him．

A．couldn’t

B．mustn’t

C．shouldn’t

D．needn’t

— Must I finish that work today?

— No, you _____. You may finish it in three days.

A．mustn’t

B．needn’t

C．shouldn’t

D．couldn’t

——Can I walk across the road now, mum?

——No, you_______. You have to wait until the light turns green.

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

(2006年徐州市)

--- Must I finish that work today?

--- No, you ________. You may finish it in three days.

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