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【题目】5G is an exciting mobile technology, ________ will give a massive boost to smart cities and vehicles.

A.whereB.whenC.thatD.which

【答案】D

【解析】

考查定语从句。句意:5G是一项令人兴奋的移动通讯技术,它将极大地推动智能城市和汽车的发展。5G作为先行词是一个事物,定语从句中又缺主语并且前还有逗号,所以不能用that,只能用关系代词which。故此题选D

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