The manager______the workers how to improve the program since 9 a.m.

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问题 The manager______the workers how to improve the program since 9 a.m.

选项 A、has told
B、is telling
C、has been telling
D、will have told

答案C

解析 句意为从上午九点开始,经理在一直不停地告诫工人如何去完善这个项目。由时间状语since 9 a.m.可先排除B和D;根据句意,此处需要的是“一直不停地告诫”,强调持续性,应用完成进行时。故答案为C。
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