the book ( ) I want to get is well written

问题描述:

the book ( ) I want to get is well written
A.who B.whom C.that
Mr Green told me ( )he had been to France twice
A.what B./ C.where
( ) is crucial to learn to some computer skills in this modern society
A.it B.that C.what

CBA保证是对的.不懂问