The teacher told us the best way English. A. learnB. learningC. to learnD. learned

问题补充：

The teacher told us the best way English.

A. learn

B. learning

C. to learn

D. learned

答案：

A. learn

B. learning

(答案→)C. to learn

D. learned

解析：句意：老师告诉我们一个最好的学习英语的方法。动词不定式做定语表示具体的将要进行的动作，结合语境可知选C。