填空题

【参考答案】

B
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单项选择题
--Must I finish the term paper before Friday
A．No, you mustn't
B．Yes, you may
C．No, you don't have to
D．Yes, you need
单项选择题
When I arrived, I learned Mary ______ for almost an hour.
A．had gone
B．had set off
C．had left
D．had been away
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