★★ 三道差不多的英语题1.All the students' composition had a lot of spe

★★ 三道差不多的英语题
1.All the students' composition had a lot of spelling mistakes ______Ben’s,so the teacher spoke highly of Ben in her class.
A.except B.beside C.except for D.besides
2.All the students' composition had a lot of spelling mistakes ______Ben’s,so the teacher was very mad at everyone in the class.
A.except B.beside C.except for D.besides
3.Ben's composition was almost perfect ______several spelling mistakes.
A.except B.beside C.except for D.besides
请给出except和except for的详细区别,百度知道里“except和except for”这个问题的已有答案前后矛盾,不要引用给我.