单选题the maths problem is ____ difficult _____A so ;that few of us can do .. B so ;that few of us can do itC too;for anyone of us to do D too;for anyone of us to do it请说原因

问题描述:

单选题the maths problem is ____ difficult _____
A so ;that few of us can do .. B so ;that few of us can do it
C too;for anyone of us to do D too;for anyone of us to do it
请说原因