Question

【题目】Mary quickly closed the door of her room _________ her father could reach it to keep him out.

A. before B. when C. as D. while

Answer 1

【答案】A

【解析】

试题分析: 句意:在父亲到门口之前，玛丽迅速关上自己的房门，把他挡在外面。A. before在……之前；B. when 当……时候；C. as按照，当……时候；D. while与此同时。根据句意选A项。