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My grandpa used to know the world ______...

My grandpa used to know the world ________ the radio. Now he can get more information about our society on the Internet.

A.on B.by C.in D.with

 

A 【解析】 考查介词的用法。句意为:我爷爷过去通过收音机了解这个世界。现在他可以在网络上得到关于这个社会的更多信息。on通过;by通过某种方式;in用语言;with用具体的东西。on the radio通过收音机。故选A。  
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