When we a foreign language we’d respect its or we can’t really learn it well.A. speak;

问题补充：

When we a foreign language, we’d respect its , or we can’t really learn it well.

A. speak; idioms

B. study; ways

C. learn; customs

D. master; manners

答案：

A. speak; idioms

B. study; ways

(答案→)C. learn; customs

D. master; manners

解析：词义辨析。句意：当我们学会一门外语时，我们最好尊重它的语言习惯，否则我们不可能真正把它学好。结合语境可知选C。