Three quarters of the area covered with wetland, and a quarter of the red-crowned cranes living happily here.A.is; is B.are; is C.is; are D.are; are 题目和参考答案——青夏教育精英家教网—

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Three quarters of the area ________ covered with wetland, and a quarter of the red-crowned cranes ________ living happily here.

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

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