单项选择题

He gave a talk ________ modern music.

A．after
B．in
C．about
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单项选择题
I’m sure it won’t work. Can’t you come up with a ________ idea
A．best
B．better
C．good
单项选择题
When I got to the railway station, the train________.
A．left
B．had left
C．has left
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