单项选择题

Statisitcs ______ an important course in our department ten years ago.

A．was
B．is
C．were
D．are
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单项选择题
I wish I ______ you, but I don't know his phone number.
A．can help
B．can have helped
C．could help
D．could have helped
单项选择题
Thanks a lot, but you ______ me a birthday present.
A．hadn't given
B．didn't have to give
C．must not have given
D．couldn't give
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