单项选择题

That is not impossible, ______

A. is that
B. isn' t that
C. is it
D. isn' t it
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单项选择题
I suppose you' re not going out today, ______
A. are you
B.. do you
C. aren't you
D. don' t you
单项选择题
They have to study a lot, ______
A. don' t they
B. did they
C. haven' t they
D. hadn' t they
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