The manager __________ the workers how to improve the program since 9 am.
| A．has told |
| B．is telling |
| C．has been telling |
| D．will have told |
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The manager __________ the workers how to improve the program since 9 am.
| A．has told |
| B．is telling |
| C．has been telling |
| D．will have told |
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