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4.---Must I finish the work to day?---Yes,but you ________finish it now.(  )
A.mustB.needC.need toD.don't have to

分析 --今天我必须完成这项工作吗?
--是的,但是你不必现在就完成它.

解答 答案:D.
根据but you ________finish it now.可知这里应该用否定形式,must的含义是必须一定,其否定形式mustn't表示禁止的含义.在这里不是禁止的意思.must的否定回答一般可借助于needn'和don't have to来构成,表示不必.故选D.

点评 本题考查了情态动词的用法.注意must的用法以及它的肯否定形式.

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