-“Each of the students working hard at his or her lessons to go to university.”---

问题补充：

---- “Each of the students, working hard at his or her lessons,to go to university.” -----“So do I.”

A. hope

B. hopes

C. hoping

D. hoped

答案：

A. hope

B. hopes

C. hoping

D. hoped

解析：

句子的真正主语是each of the students，横线处填的hopes是句子谓语，其中的working hard at his or her lessons是插入句中修饰主语的非限制性定语。