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

分析 他喜欢朗读.现在他肯定在图书馆里朗读.

解答 答案:A.考查情态动词.句意"他喜欢朗读.现在他肯定在图书馆里朗读".must肯定,can能.根据He likes reading他喜欢朗读,可知肯定是在图书馆里朗读,用must.由now现在,可知是现在进行时态,is/am/are+动词的现在分词.must后用be动词原形be.read的现在分词是reading.答案是A.

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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