It is to known to us all that good friends ____happiness and value life .填什么?

题目

It is to known to us all that good friends ____happiness and value life .填什么?
A.add B.adds C.add to D.adds to
希望有讲解.
抱歉 真的是 打错了
原文It is known to us all that good friends ____happiness and value to life .

答案

答案C,add to是增加的意思,如：the snowy weather added to our difficulty of going forward.B和D时态不对.add不能单独用,add…to…把什么加到什么里这句话的翻译是：众所周知,好朋友会增加（我们的）幸福还有让我...