题目内容
High-speed trains, shared bikes, shopping online and Alipay have become China’s new four inventions because________ of them are leading the world in science and technology.
A.both B.either C.all
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题目内容
High-speed trains, shared bikes, shopping online and Alipay have become China’s new four inventions because________ of them are leading the world in science and technology.
A.both B.either C.all