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 --我必須今天早上還書嗎?
--不,你不需要.但是你需要下周一前還它.

解答 答案:D.考查情態(tài)動(dòng)詞.第一個(gè)空,must開頭的一般疑問(wèn)句,否定回答通常用needn't.表示不需要.因此B,C不正確.第二個(gè)空,must必須,語(yǔ)氣比較強(qiáng)烈,后用動(dòng)詞原形,根據(jù)to可知,A不正確.need to do sth需要做某事,答案是D.

點(diǎn)評(píng) 情態(tài)動(dòng)詞無(wú)人稱和數(shù)的變化;不能單獨(dú)使用,必須與其后的動(dòng)詞原形構(gòu)成謂語(yǔ).否定形式通常在后面加not.要注意情態(tài)動(dòng)詞的不同用法.

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