The manager _______ the workers how to improve the program since 9 a.m.
A．has toldB．is tellingC．has been telling D．will have told
C
本題考查時(shí)態(tài)。句意為：從上午九點(diǎn)開始，經(jīng)理在一直不停地告誡工人如何去完善這個(gè)項(xiàng)目。由時(shí)間狀語(yǔ)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(qiáng)調(diào)持續(xù)性，故完成進(jìn)行時(shí)更好，所以答案選C。
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