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. 【查看更多】
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(09陕西卷)16. He must be helping the old man to water the flowers, ?
