Question

How I wish I could bring some laughter to my students who ________ so hard．

1. A.
   will work
2. B.
   had worked
3. C.
   have been working
4. D.
   were working

Answer 1

C
现在完成进行时表示“到现在为止一直在做某事”，所以该题答案为C项，说明学生们“一直都在努力学习”。