单项选择题

He gave orders that the prisoners ______ free.

A．are set
B．were set
C．be set
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单项选择题
He drives much ______ than he did three years ago.
A．more carefully
B．carefully
C．more careful
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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