单项选择题
Some metals are better conductors of electricity than others,______ means that the former has atoms that contain more free electrons than the latter.
A.that
B.this
C.it
D.which
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单项选择题
In many American families, parents feel that children should make important decisions ______.
A.to themselves
B.on themselves
C.by themselves
D.of themselves
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单项选择题
They hurried there only to find the meeting canceled. In fact, they______ at all.
A.needn't have gone
B.might not have gone
C.mustn't have gone
D.couldn't have gone
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