---Look!Mr．Chen is playing volleyball so well on the playground．---It be him．He's now having the math class in the classroom．( )A．can'tB．mustn'tC．may notD．needn't 题目和参考答案——青夏教育精英家教网—

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20．---Look!Mr．Chen is playing volleyball so well on the playground．
---It ______ be him．He's now having the math class in the classroom．（　　）

A．

can't

B．

mustn't

C．

may not

D．

needn't

分析 --看！陈老师在操场上打排球打的如此好．
--不可能是他．现在他正在教室里上数学课．

解答答案：A．can't不可能；mustn't不可以，禁止；may not可能不；needn't不必．根据He's now having the math class in the classroom，可知陈老师正在教室里上数学课，所以在操场上打排球的那个人不可能是他．may not----也许不（推测时不太有把握）can't------不可能（推测时很有把握）．故选A．

点评本题考查了情态动词的用法．解答时注意理解句意以及所给选项的意思．

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