英语语法：（ ）from the top of the tower,the south foot of the mountain is a sea of trees.A.Seen B.Seeing C Having seen D.To see选什么?有什么语法知识?
问题描述：
英语语法：（ ）from the top of the tower,the south foot of the mountain is a sea of trees.
A.Seen B.Seeing C Having seen D.To see
选什么?有什么语法知识?
答
A
被动语态
the south foot of the mountain is seen from the tower.
答
答案是A
SEEN from the top of the tower(被动，分词结构) == if / when you look at the south foot（主动，状语从句） - -- - ,
答
A
这是作状语的分词短语,逻辑主语是句子的主语 the south foot of the mountain .
用现在分词作状语的情况：
如果句子的主语是作状语的分词短语所表动作的执行者,用现在分词
如：
Sitting at the back of the classroom,he can't see what's on the blackboard clearly.
而如果句子的主语是作状语的分词短语所表动作的承受者,用过去分词
如：
Seen at the top of the mountain,the school looks more beautiful.