part that vocabulary plays in learning foreign language should never be ignored.A. The;

问题补充：

part that vocabulary plays in learning foreign language should never be ignored.

A. The; /

B. A; /

C. The; a

D. A; the

答案：

A. The; /

B. A; /

(答案→)C. The; a

D. A; the

解析：句意：词汇在学习一门外语中起的作用永远不应该被忽视。第一空填the，特指“词汇在学习一门外语中起的作用”，第二空填a，泛指“一门外语”，所以选C。