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一个英语问题Wal-Mart,which is one of the largest American supermar

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一个英语问题
Wal-Mart,which is one of the largest American supermarket chains,_____ some of its store open 24 hours on Mondays through Saturdays.
A.keeps B.keep C.have kept D.had kept
这是当时的一道高考题,选A.如果用keeping行吗?
不可以.which引导的是非限制定语从句,用来修饰主语Wal-Mart.在整个句子中,keep是谓语动词,因为主语Wal-Mart是单数第三人称,所以谓语动词keep要用相应形式keeps.