【题目】---Where is Mary?
---Oh, she went out after breakfast, and her paper in the library ever since. You can find her there.
A. Wrote B. had written
C. has been writing D. is writing
在线课程【答案】C
【解析】
考查时态。句意：——Mary去哪了？——她吃完早饭就出去了，从那以后她就一直在图书馆里写论文，你可以在那找到她。Mary写论文这个动作从过去一直持续到现在，而且还可能继续下去，应该用现在完成进行时，故C项正确。