Question

【题目】He was sleeping in his bedroom _______ the snowstorm started.

A. whileB. whenC. asD. after

Answer 1

【答案】B

【解析】

句意：当暴风雪开始的时候，他正在卧室里睡觉。while当……时候， when当……时候，as随着，after在……之后。根据句型sb was doing sth when sb /sth did sth，表示当……时候，某人正在做某事，故选B。