---Each of the students working hard at their lessons the book.-- So have I.A. is read

问题补充：

---Each of the students working hard at their lessons the book.

---- So have I.

A. is reading

B. has read

C. read

D. reads

答案：

A. is reading

(答案→)B. has read

C. read

D. reads

解析：时态题。根据回答So have I.用到了助动词have是帮助构成完成时态，所以选B。句意：每个努力学习的学生都读过这本书。我也读过。