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
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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