Grades would from one or two，for outstanding or excellent，to six or seven，for poor or very poor.
A. suffer
B. differ
C. e
D. range
网友回答
A. suffer
B. differ
C. e
(答案→)D. range
解析：此题考查动词辨析。suffer from“遭受，忍受……”；differ from“与……不同”；e from“来自于”；range from A to B/range between A and B“在A ，B之间变化或变动”。句意：各年级分组将从一两个杰出或优秀的到六七个差的或者很差的。