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【题目】When was __________ umbrella __________ ?

A. /; invented??? B. a ; discovered??? C. an, discovered??? D. the, invented

【答案】D

【解析】句意:雨伞是什么时候发明的?discover发现,invent发明;伞被发明应用动词invented;故排除BC;a/an表示“一个……”,表示数量或泛指某类事物,a用于辅音因素开头的可数名词单数前,an用于元音因素开头的可数名词单数前; [?m'brel?]的发音是以元音为开头的,排除B;可数名词单数不能单独使用,排除A; the表示特指某事物,the umbrella指这种雨伞的发明,an umbrella表示泛指雨伞的发明根据语境和句意可知选D。

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