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【题目】In the village,ninety percent of the trees_______green and ninety percent of the air________clean.

A.is;is B.are;are C.is;are D.are;is

【答案】D

【解析】

试题分析:句意:在村子里,90%的树是绿色的,90%的空气是干净的。分数和百分数在句中做主语的时候,谓语动词应该根据它所修饰的名词形式决定,第一个空前trees是复数,故谓语动词用复数;第二个空前的air是不可数名词,故谓语动词用单数。选D。

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