Was important to build Great Green Walls all over the world? A. this B. that C. it D. he——青夏教育精英家教网—

摘要：Was important to build Great Green Walls all over the world? A. this B. that C. it D. he

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A. this 　　　　　　　　 B. that 　　　　　　　　 C. it 　　　　　　　　 D. he

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