【題目】—Sam, come downstairs, please. I need your help.
—Sorry, Mum. I _________ on the phone.
A.am talking
B.talked
C.was talking
D.have talked

【答案】A
【解析】考查現(xiàn)在進(jìn)行時�！粳F(xiàn)在進(jìn)行時】表示說話時正在進(jìn)行或發(fā)生的動作,也可表示當(dāng)前一段時間內(nèi)的活動或現(xiàn)階段正在進(jìn)行的動作．結(jié)構(gòu)：助動詞 be ( am / is / are ) +現(xiàn)在分詞。句意：Sam,下樓來，我需要你的幫助。對不起，媽媽，我在打電話。I am talking on the phone。所以答案是A。

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