单项选择题

This box is ______ than that one.

A．heavier
B．heavy
C．heaviest
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单项选择题
Don't worry. The children are now old enough to ______ themselves.
A．look round
B．look after
C．look for
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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