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

    A.whileB.beforeC.afterD.when

    【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……之前;after……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。

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