Three-fourths of the land by forest and grass. A. has covered B. has been covered C. have bee——青夏教育精英家教网—

摘要： Three-fourths of the land by forest and grass. A. has covered B. has been covered C. have been covered D. are to be covered

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Three-fourths of the land 　　　 by forest and grass.

　 A. has covered　　 B. has been covered　 C. have been covered　 D. are to be covered

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