选哪个,为什么 —— from the top of the tower,the mountain is a sea of trees.A seen.B seeing.C have seen.D to see
问题描述：
选哪个,为什么 —— from the top of the tower,the mountain is a sea of trees.A seen.B seeing.C have seen.D to see
答
A
Seen 表示被动
句子的主语是mountain,山被人看moutain is seen from the top...,需要用被动形式
前半句不是完整的从句,所以用非谓语形式,选择A