单项选择题

Your sister used to visit you quite often, ______

A．isn't she
B．use not she
C．wasn't she
D．didn't she

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单项选择题

A．and
B．yet
C．not
D．just

单项选择题

The desk over there ______ hard wood.

A．is made of
B．is made from
C．is made up of
D．is made by

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