单项选择题

New problems are always ______ in the conference of the factory.

A．raising
B．going up
C．appearing
D．coming up
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单项选择题
Mary keeps talking about the party. She had a very good time, ______ she
A．hadn't
B．had
C．didn't
D．did
单项选择题
Trains used to stop here to ______ us.
A．get off
B．pick up
C．pull up
D．get past
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