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30.   It was once called the Sea of Bamboo, but now only one fifth of the area ______ covered with bamboo, and sixty percent of other plants ______ taken the place of the bamboo.

A.are; have B.is; has C.is; have D.are; has
科目 英语   题型 单选题   难度 较易
知识点: 主谓一致
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