题目内容
20、
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
试题答案
20、 B
解析：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，因此反意疑问句根据助动词be来构成，故选B。
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