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I think he must be writing his essay at home now, ? A.is he B.isn’t he C.do I D.

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I think he must be writing his essay at home now, ? A.is he B.isn’t he C.do I D.

I think he must be writing his essay at home now,______?

A.is he             B.isn’t he          C.do I              D.mustn’t he

 

试题答案

【答案】

B

【解析】

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