问题
选择题
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
答案：B
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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