单项选择题

Generally, the thicker a mammal's (哺乳动物) skin is, the less hair

A．that has it
B．That it has
C．has it
D．it has
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单项选择题
He couldn't use his own car because it ______ then.
A．was being repaired
B．was repairing
C．is repairing
D．has been repaired
单项选择题
It took them more than ten years to ______ the defensive works.
A．build
B．build into
C．build on
D．build up
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