Question

【题目】 _______ they_______, their classmates were all in the classroom.

A. Before ; were arguing B. When ; are arguing

C. While ; were arguing D. While ; are arguing

Answer 1

【答案】C

【解析】

试题分析：句意：他们在争论的时候，他们的同学们都在教室里。Before在……之前；When当……时候；While当……时候；were arguing过去进行时，表示过去某个时间正在发生的动作；are arguing现在进行时，表示此刻正在发生的事情。根据句意和句中their classmates were…可知，这句话应该用过去时态，故选C。