【帮帮】高中英语There are 28 classes in the school,B(each having)ove

【帮帮】高中英语There are 28 classes in the school,B(each having)over 56 students.A.with each has B each having c which there are D which each that has通过排除法我能选出来 可是这个选项还不太明白 希望可以帮我分析一下句子结构什么的是独立主格结构么