He must be helping the old man to water the flowers, ()?
A、
is he
B、
isn't he
C、
mustn't he
D、
must he
【正确答案】:B
【题目解析】:
反义疑问句的用法。
He must be helping the old man to water the flowers, ()?
is he
isn't he
mustn't he
must he
反义疑问句的用法。
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