问题补充:
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
答案:
A. is he
(答案→)B. isn’t he
C. do I
D. mustn’t he
解析:考查反义疑问句。本题中有一个省略部分I think,当句子有情态动词表示推测的时候,如果有现在时的时间状语,就对现在时进行反问。本题中有Now,主句有be动词,故就对系动词Be进行反问,故B正确。句意:我认为现在他一定在家写论文,不是吗?
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