. from the top of the tower the south foot of the mountain is a sea of trees .A. SeenB. S

问题补充：

. 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

答案：

(答案→)A. Seen

B. Seeing

C. Have seen

D. To see

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