单项选择题
Hardly______ the helicopter______ when the waiting crowd ran toward it.
A.had; landed
B.has; landed
C.did; land
D.was; landing
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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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