Lucy and I are in different but we are good friends.A. classB. gradesC. gradeD. school

问题补充：

Lucy and I are in different , but we are good friends.

A. class

B. grades

C. grade

D. school

答案：

A. class

(答案→)B. grades

C. grade

D. school

解析：A班级B年级，复数形式C年级，单数形式D学校。different后应加名词复数，不同的.......。句意：露西和我在不同年级，但是我们俩是好朋友。