--Excuseme,MayIknowwhichclassyouarein?
--Ofcourse.I'min_____..
A.5Classes,3Grades
B.3Grade,5Class
C.Class5,Grade3
D.the3rdgradeandthe5thclass
A是不是因为加了复数所以不选啊?辨析一下B,C选项,他们长得好像~像D选项这么说不行吗?