It’s important for us to employ a word or a phrase according to the in language studies.A

问题补充：

It’s important for us to employ a word or a phrase according to the in language studies.

A. situation

B. condition

C. translation

D. expression

答案：

(答案→)A. situation

B. condition

C. translation

D. expression

解析：employ意为“使用,利用”;situation 这里指的是“语境”。