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

 

 

 B

解析：考查反意疑問句。陳述句中的謂語中雖有情態(tài)動詞must，但此處must表示對正在進(jìn)行的動作進(jìn)行推測，因此反意疑問句根據(jù)助動詞be來構(gòu)成，故選B。

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