All the students in our class made progress by studying harder this term.A. aB. greatC. a

问题补充：

All the students in our class made progress by studying harder this term.

A. a

B. great

C. a great

D. 不填

答案：

A. a

(答案→)B. great

C. a great

D. 不填

解析：句意：我们班所有的学生这学期通过努力学习都取得了很大的进步。且progress是不可数名词，所以选B。