20．He likes reading．Now he _____ in the library．（　�。�
A．must be readingB．must have readC．can't readD．read

分析 他喜歡朗讀．現(xiàn)在他肯定在圖書館里朗讀．

解答 答案：A．考查情態(tài)動(dòng)詞．句意"他喜歡朗讀．現(xiàn)在他肯定在圖書館里朗讀"．must肯定，can能．根據(jù)He likes reading他喜歡朗讀，可知肯定是在圖書館里朗讀，用must．由now現(xiàn)在，可知是現(xiàn)在進(jìn)行時(shí)態(tài)，is/am/are+動(dòng)詞的現(xiàn)在分詞．must后用be動(dòng)詞原形be．read的現(xiàn)在分詞是reading．答案是A．

點(diǎn)評(píng) 情態(tài)動(dòng)詞無人稱和數(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．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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