题目内容

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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