Walmart，which is one of the largest American supermarket chains，________ some of its stores open 24 hours on Mondays through Saturdays.(2012·安徽)
A．keepsB．keepC．have keptD．had kept
A
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)。根據(jù)句中的“is”可知，此處應用一般現(xiàn)在時，主語為Walmart，謂語動詞要用第三人稱單數(shù)，故選A。
易錯點撥　本題易錯選B或C，錯把supermarket chains當成主語。
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