单项选择题
It is a good idea for parents to monitor the ______as well as the kind of television that their children watch.
A.number
B.size
C.amount
D.screen
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单项选择题
E-mail writing has became the usual means of communication ______ people some distance away.
A.for
B.on
C.to
D.with
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单项选择题
As Christmas was coming, the town began a ______ clearing on a large scale.
A.through
B.thorough
C.though
D.thought
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