单项选择题

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
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It's impossible for a child to do so much work within a short period of time, ______
A. isn't it



B. is it
C. has it



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单项选择题
Jack felt unhappy as they all went outing ______ him.
A. except



B. but
C. without



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