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
问题描述：
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
答
选A
将句子还原回去是这样的：
the mountain is seen
答
答案：
A
表状语
后者 the south foot of the mountain 是被看,表被动,所以选择 A
B 表主动,不符合
C have seen 是现在完成时,前面一定要有主语.
D.结构不符合.