l b( ) classes at eight o`clock

l b( ) classes at eight o`clock ( ) finish at 2:00.l Which is wrong?A.Class all B.All the classes C.All of my class D.All classes Classes begin at eight. classes begin at enght.为什么classes Our school ——at eight in the morning A.begin class B.begin classes C.begins classD.begins classes （ ）begins at eight .A:school B:A school C:Classes D:Class They have classes ____ school on weekdays.A.after B.for C.at D.before _____ begin at 7:30 in the morning.A.Classes B.Lessons C.Class D.School At school we have six classes _day.A,one B.in a C,a选择? 1、 begin at 8:00.A.The class.B.Class C.Classes Classes begin_____7:55A.in B.on C.at D.for Classes begin______seven fifty-five.A.in B.on C.at D.for Classes _____ at 8:00 every day .A .study B.studies C.begin D.begins帮个忙啊 ———your classes begin at 7:30?A Are B Does C Do 英语选择：Classes ____ at 8:00 A.starts B.are start C.begins D.start 12.______ finish at 2:00 in the afternoon.A.My all class B.All my classes C.My all classes选什么?请问. _____finish at 2:00.Which is wrong?A Class B All the classes C All of my class D All classes 结构力学 i=EI/l是什么意思