people began to use mobile phones(phone) from then on.哪个是对的

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peoplebegantousemobilephones(phone)fromthenon.哪个是对的peoplebegantousemobilephones(phone)fromthenon.哪个是

people began to use mobile phones(phone) from then on.哪个是对的
people began to use mobile phones(phone) from then on.
哪个是对的

people began to use mobile phones(phone) from then on.哪个是对的
phones复数表示泛指