Walmart, which is one of the largest American supermarket chains, some of its store open 24 hours on Mondays through Saturdays.
A. keep
B. keeps
C. have kept
D. had kept
网友回答
A. keep
(答案→)B. keeps
C. have kept
D. had kept
解析：句意：美国最大的连锁超市之一沃尔玛，从星期一到星期六会使它的一些商店保持24小时营业。谓语动词是keep,句子表明的是一般的情况，故用一般现在时，故选B.