It's important___English well.A to us to learn B of us to learn C for us to learn D to us learning

It's important___English well.A to us to learn B of us to learn C for us to learn D to us learning
It's important___English well.A to us to learn B of us to learn C for us to learn D to us learning

It's important___English well.A to us to learn B of us to learn C for us to learn D to us learning
C
it's adj.for sb.to do sth.对于某人来说,做某某是 是..（重要的,无聊的...）

C for us to learn

大大的C~

d