he must be helping the old man to water the flowers,

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he must be helping the old man to water the flowers,
Ais he Bisn't he Cmust he Dmustn't he

选择B.must反义疑问句的详细用法讲解如下：
当陈述部分有情态动词must,问句有4种情况：
　　（1）mustn't表示“禁止,不可,不必”时,附加问句通常要用must.
　　You mustn't stop your car here,must you?
　　你不能把车停在这地方,知道吗?
　　（2）must表示“有必要”时,附加问句通常要用needn't.
　　They must finish the work today,needn’t they?
　　他们今天要完成这项工作,是吗?
　　（3）当must用来表示对现在的情况进行推测时,问句通常要根据must后面的动词采用相应的形式.
　　He must be good at English,isn’the?他英语一定学得很好,是吗?
　　She must be a good English teacher,isn’t she?她一定是位优秀的英语老师,是吗?
　　（4）当must have done表示对过去的情况进行推测（一般句中有明确的过去时间状语）,问句要根据陈述部分谓语的情况用“didn't+主语”或“wasn't/weren't+主语”；如果强调动作的完成（一般没有明确的过去时间状语）,问句要用“haven't/hasn't+主语”.
　　She must have read the novel last week,didn’t she?
　　她上星期一定读了这本小说,是吗?
　　You must have told her about it,haven’t you?
　　你一定把这事告诉她了,是吗?
速记方法　　前肯后否,前否后肯,前be后be,前无be后加助,时态一致.

238.He must be helping the old man to water the flowers,____ he must be helping the old man to water the flowers, Look,the old man _ (water) the flowers in the garden. The old man is ___the flowers with water in the garden.A.put 英语好的人进空the old man 空《water》the flowers every day. We must be kind to the old. look,he ______( carry)water for the old man. We must water the flowers every day. The flowers must ________(water)every day. The old man shoud be spoken to 7.The old man smiled when he saw how pretty _____ up to be d 1The old man always______so he likes to be with him.