.We often talk a great deal about English language teaching that it is the learning that

问题补充：

.

We often talk a great deal about English language teaching, that it is the learning that really matters.

A. having forgotten

B. forgotten

C. forgetting

D. to have forgotten

答案：

A. having forgotten

B. forgotten

(答案→)C. forgetting

D. to have forgotten

解析：