This,together with the gases and fumes from vehicles,___rain into acidA.turns B.turning 这里的turn是非谓语动词吗?

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This,together with the gases and fumes from vehicles,___rain into acidA.turns B.turning 这里的turn是非谓语动词吗?
This,together with the gases and fumes from vehicles,___rain into acid
A.turns B.turning 这里的turn是非谓语动词吗?

This,together with the gases and fumes from vehicles,___rain into acidA.turns B.turning 这里的turn是非谓语动词吗?
A ,不是非谓语动词,整个句子里缺少谓语动词

选A,你可以忽略together with the gases and fumes from vehicles这个从句,只看句子主干的话,句子就成了This____rain into acid.
这样很显然就应该选turns,才能构造成一个完整的句子,turning本身不是动词,除非前面加了be的形态才能在这里用。