题目内容

He must be helping the old man to water the flowers,______ ?      
A．is heB．isn’t heC．must heD．mustn’t he
B
考查反意疑问句。陈述句中的谓语中虽有情态动词must，但此处must表示对正在进行的动作进行推测，将其不看作情态动词。而must后有助动词be，故反意疑问句根据助动词be来构成，选B。
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