【題目】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】考查插入語和句子主語的判斷。which is one of the largest American supermarket chains是插入語。句子的主語是Walmart，故謂語動詞要用單數(shù)形式。而句中的"is"可知,此處應(yīng)用一般現(xiàn)在時。句意：沃爾瑪是美國最大的連鎖超市之一,部分店從星期一到星期六24小時營業(yè)。故選A。

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