用in.
比如：In Grade Seven 在七年级
The students are in Class Five， Grade Seven.这些学生在七年级五班
Tom is in Class One with Lingling. 汤姆和玲玲在一班。
=Tom with Lingling is in ClassOne.
=Tom and Lingling are in Class One
特殊用法:
Welcome to Class 6 Grade 7 ! 欢迎到七年级六班。
on grade 7还是in grade
是in grade，例如：
1、The boy first showed promise as an athlete in grade school.这个男孩在上小学的时候就初次显示出成为运动员的潜力。
2、I was just in grade school at the time， but I remember it perfectly.那时我还在上小学，但是我记得非常清楚。
3、I'；m John. I'；m in Grade Eight at Rocky Mountain High School.我叫约翰，我在洛基山高中读八年级。
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