单项选择题

--Can you answer that question
--Sorry, I ______.

A．can't
B．don't
C．mustn't
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单项选择题
--Would you like a bottle of mineral water
A．Yes, I will
B．No, please
C．No, thanks
单项选择题
It takes ______ two days to finish this report.
A．he
B．him
C．his
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