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He must be helping the old man to water the flowers, ? A. is he B. isn’t he C. must he D. mustn’t he [答案]B 考查反意疑問(wèn)句.陳述句中的謂語(yǔ)中雖有情態(tài)動(dòng)詞must.但此處must表示對(duì)正在進(jìn)行的動(dòng)作進(jìn)行推測(cè).將其不看作情態(tài)動(dòng)詞.而must后有助動(dòng)詞be.故反意疑問(wèn)句根據(jù)助動(dòng)詞be來(lái)構(gòu)成.選B. 【查看更多】

 

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(09陜西卷)16. He must be helping the old man to water the flowers,        ?    

A. is he     B. isn’t he     C. must he     D. mustn’t he

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