2.一Mum,must I clean my room?-No,you       .( 。
A.mustn'tB.needn'tC.can't

分析 --媽媽,我必須打掃房間嗎?
--不,你不必.

解答 答案:B.
根據(jù)No,可知下面為否定回答,must的含義是必須一定,其否定形式mustn't表示禁止的含義.在這里不是禁止的意思.must的否定回答一般可借助于needn'和don't have to來構成,表不必.故選B.

點評 本題考查了情態(tài)動詞的用法.注意must的用法以及它的肯否定形式.

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