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20．. from the top of the tower, the south foot of the mountain is a sea of trees. A. Seen B. Seeing C. Have seen D. To see 【查看更多】

 

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（陜西卷16）._____from the top of the tower, the south foot of the mountain is a sea of trees.   

  A. Seen            B. Seeing        C. Have seen     D. To see

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