Question

【題目】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】

考查從屬詞義辨析。句意為:________吉姆向我求助時(shí)我正在給我媽媽打電話。while當(dāng)……時(shí)；before在……之前；after在……之后；when當(dāng)……的時(shí)候。be doing sth. when...正在做某事時(shí)，突然……，為固定句型。故選D。