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
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B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 …。