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
网友回答
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。