Many factors influence a student in his/her study I think are out of a teacher’s control

问题补充：

Many factors influence a student in his/her study, I think are out of a teacher’s control.

A. most of them

B. most of which

C. most of what

D. most of that

答案：

A. most of them

(答案→)B. most of which

C. most of what

D. most of that

解析：这个句子尤其要注意区分A和B选项的不同，只要我们注意了标点符号就知道这并不是个并列句，所以不能选A。因为是逗号，说明后面是个非限制性定语从句，这里考查的是介词＋which的用法，原句可还原成…most of the factors …。