问题补充：
from the mountain, the town is very beautiful.
A. Being seen
B. It was seen
C. Seen
D. Seeing
答案：
A. Being seen
B. It was seen
(答案→)C. Seen
D. Seeing
解析：考察分词，分词做状语，分词有两种形式，一是过去分词；二是现在分词。动词和名词是主谓关系时，用现在分词做状语；当动词和明是动宾关系时，用过去分词。动词see和名词the mountain是动宾关系，所以选C
