Question

【题目】I was just about to leave _______ the telephone rang.

A. whenB. whileC. becauseD. since

Answer 1

【答案】A

【解析】

句意：我正要离开，突然电话响了。when当……时候，与短暂性动词连用；while当……时候，与延续性动词连用；because因为，since自从。根据句型be about to do sth when+从句，表示正在做某事，突然……，故选A。