Is it important us learn English well?A. for learning B. for to learnC. of learningD.

问题补充：

Is it important us learn English well?

A. for, learning

B. for, to learn

C. of, learning

D. of, to learn

答案：

A. for, learning

(答案→)B. for, to learn

C. of, learning

D. of, to learn

解析：本题符合句子结构It is adj for sb to do sth,故选答案为B