Question

【题目】I was giving a phone call to my mum________ Jim asked me for help.

A.whileB.beforeC.afterD.when

Answer 1

【答案】D

【解析】

考查从属词义辨析。句意为:________吉姆向我求助时我正在给我妈妈打电话。while当……时；before在……之前；after在……之后；when当……的时候。be doing sth. when...正在做某事时，突然……，为固定句型。故选D。