单项选择题

I was listening to the music ______ there was a knock at the door.

A．when
B．while
C．because
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单项选择题
We decided not to climb the mountain because it was raining ______ .
A．hardly
B．strongly
C．heavily
单项选择题
—Happy birthday to you!— ______ .
A．The same to you
B．Thank you very much
C．OK
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