单项选择题

A．Jack has been hard to return the book.
B．Jack has examined their machine.
C．Jack has to work quickly.
D．Jack is too busy to help them now.
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单项选择题
A．No, you don’t.B．That’s all right.C．Thank you, but I think I can manage it.D．It’s none of your business.
A．No, you don’t.
B．That’s all right.
C．Thank you, but I think I can manage it.
D．It’s none of your business.
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