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 |
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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 |
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