单项选择题

The books on the desk are not mine; they're ______.

A．him
B．theirs
C．their
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单项选择题
He turned off the lights and then ______ the room.
A．leaved
B．leaves
C．left
单项选择题
He drives much ______ than he did ten years ago.
A．carefully
B．more careful
C．more carefully
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