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单选题
The resistance experienced when one body moves over another, _____ it is in contact, is called frictional force.
A

to which

B

where

C

with which

D

while


参考答案

参考解析
解析:
句意:当一个物体在和它接触的物体上运动时,产生的阻力叫做摩擦力。in contact with 与…联系,接触。此处,which引导定语从句,修饰another,从句中的it指one body。
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