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
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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