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

試題分析:考查反義疑問句。本題中有一個省略部分I think,當(dāng)句子有情態(tài)動詞表示推測的時候,如果有現(xiàn)在時的時間狀語,就對現(xiàn)在時進(jìn)行反問。本題中有Now,主句有be動詞,故就對系動詞Be進(jìn)行反問,故B正確。句意:我認(rèn)為現(xiàn)在他一定在家寫論文,不是嗎?
點(diǎn)評:反義疑問句,要注意對主句的語義的正確理解,還要注意主句是否是表示推測還虛擬,是否有時間狀語的影響。
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