When you learn a foreign language you must forget your own one.A. above allB. after allC.

问题补充：

When you learn a foreign language, you must forget your own one.

A. above all

B. after all

C. in all

D. at all

答案：

(答案→)A. above all

B. after all

C. in all

D. at all

解析：短语辨析。A. 尤其是 B. 终究 C. 总共 D.根本；究竟。句意：当你学习外语时，尤其是必须忘掉自己的语言。选A。