单项选择题

_____ he tried, he was not successful.

A．For
B．But
C．Although
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单项选择题
We ______ any money at that time.
A．don't have
B．didn't have
C．didn't had
单项选择题
It's getting dark. Please ______ the light.
A．turn on
B．turn off
C．turn down
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