. — At present we students have access to many valuable English websites to learn English.

问题补充：

. — At present we students have access to many valuable English websites to learn English.

— As far as I know, English on is a free site visitors can not only learn the English language but also chat on line.

A. where

B. which

C. that

D. what

答案：

(答案→)A. where

B. which

C. that

D. what

解析：可联系答.案.网客服索取。