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12.-Must I return the book this morning?
-No,you _________.But you __________ to return it before next Monday.(  )
A.needn't; mustB.mustn't; canC.mustn't; mayD.needn't; need

分析 --我必须今天早上还书吗?
--不,你不需要.但是你需要下周一前还它.

解答 答案:D.考查情态动词.第一个空,must开头的一般疑问句,否定回答通常用needn't.表示不需要.因此B,C不正确.第二个空,must必须,语气比较强烈,后用动词原形,根据to可知,A不正确.need to do sth需要做某事,答案是D.

点评 情态动词无人称和数的变化;不能单独使用,必须与其后的动词原形构成谓语.否定形式通常在后面加not.要注意情态动词的不同用法.

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