单项选择题

He drives much ______ than he did three years ago.

A．more carefully
B．carefully
C．more careful
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单项选择题
I was listening to the music ______ there was a knock at the door.
A．when
B．while
C．because
单项选择题
We decided not to climb the mountain because it was raining ______ .
A．hardly
B．strongly
C．heavily
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