If you work hard it’s not so difficult you English well.A. of; learnB. for; to learnC. o

问题补充：

If you work hard, it’s not so difficult you English well.

A. of; learn

B. for; to learn

C. of; to learn

D. for; learn

答案：

A. of; learn

(答案→)B. for; to learn

C. of; to learn

D. for; learn

解析：本题符合句子结构：it‘s+adj +for sb to do sth，故选答案为B