单项选择题
Many people keep dogs as pets because dogs are regarded as () friends to people.
A. lonely
B. only
C. loyal
D. fair
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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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单项选择题
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
D. hasn't it
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