Question

The manager ______ the workers how to improve the program since 9 am

1. A.
   has told
2. B.
   is telling
3. C.
   has been telling
4. 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。