Question

【题目】(2014·陕西卷)The young couple, who returned my lost wallet, left _________I could ask for their names.

A. while B. before C. after D. since

Answer 1

【答案】B

【解析】句意：这对年轻夫妇送还了我丢失的钱包，我还没来得及问他们的名字，他们就离开了。while当……时，然而，虽然；before在……之前；after在……之后；since自从，既然。根据句意选B。