important for us English well.A. It’s to learnB. This is to learnC. It’s learningD. Th

问题补充：

important for us English well.

A. It’s, to learn

B. This is, to learn

C. It’s, learning

D. This is, learning

答案：

(答案→)A. It’s, to learn

B. This is, to learn

C. It’s, learning

D. This is, learning

解析：本题考查的是固定词组句型：It‘s +adj+for sb to do sth,it为形式主语，真正的主语为动词不定式短语，故选A