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I think he must be writing his essay at ...

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

 

B 【解析】 试题分析:考查反意问句:陈述部分是“I think/suppose/believe + 宾语从句”时,简略疑问部分应和从句相一致,但须注意否定前移的现象。这句话是和从句一致,从句中的must是表示推测,must表示“一定、肯定”等推测意义时,疑问部分一般不用情态动词,而和must后的动词相一致。这句话就是和be动词一致,因为前面是肯定,后面用否定,isn’t he?选B。 考点:考查反意问句
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