Question

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

Answer 1

C

现在完成进行时表示：过去某一动作从过去开始一直延续到现在，现在刚刚结束或还在进行。句意：经理从早上9点开始就一直在不停的告诉工人们如何改进这个项目。根据句意选C。
【考点定位】考查动词时态。