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The manager_____ the workers how to improve the program since 9 a.m.
A．has toldB．is tellingC．has been tellingD．will have told
C

試題分析：句意為：從上午九點開始，經(jīng)理在一直不停地告誡工人如何去完善這個項目。由時間狀語since 9 a.m.可以先排除B和D；根據(jù)句意，此處需要的是“一直不停地告誡”，強調(diào)持續(xù)性，故完成進行時更好，所以答案選C。
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