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According to the survey, two thirds of the area__________cov

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According to the survey, two thirds of the area__________covered by trees now and 90% of the population__________contributions to the Greening Project in the city.
A.is ; has made B.are; have made
C.is; have made D.are; has made
C

这题考察主谓 一致,当主语是分数和百分数时,谓语和它们修饰的名词一致,因为第一空的主语是 two thirds of the area所以第一空填is, ,第二空主语是90% of the population,强调具体的人,填have made.选C.