一道英语选择题.All the students in our class made...progress by studying harder this term.
问题描述：
一道英语选择题.All the students in our class made...progress by studying harder this term.
.All the students in our class made...progress by studying harder this term.
A.a B.great C.a great D.不填
答
B（progress 是不可数名词）