This exercise is ___ different ____.
问题描述：
This exercise is ___ different ____.
A so;that few of us can do
B so;that few of us can do it
C very;for anyone of us to do
D very;for anyone of us to do it
答
B
so...that固定句式
that 后面应是完整句,不能缺宾语it,故要加it,