问题
选择题
______ 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
这题考查过去分词做状语的用法：See 和主语主语the south foot of the mountain是被动关系，选A。句意是：从塔顶上看，这座山的南山角是一片树。选A。