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【题目】Walmart, which is one of the largest American supermarket chains, some of its stores open 24 hours on Mondays through Saturdays.

A.keeps B.keep C.have kept D.had kept

【答案】A

【解析】考查插入语和句子主语的判断。which is one of the largest American supermarket chains是插入语。句子的主语是Walmart,故谓语动词要用单数形式。而句中的"is"可知,此处应用一般现在时。句意:沃尔玛是美国最大的连锁超市之一,部分店从星期一到星期六24小时营业。故选A。

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