____the introduction, the professor explained the major concept

____the introduction, the professor explained the major concept that would be covered in the class.
A、By
B、Like
C、For
D、In
【正确答案】：D
【题目解析】：考查介词词义。四个选项均为介词。选项A.By(通过,依据,经由);选项B.like(像,如同);选项C.For(为了,对于,因为);选项D.In(按照,在…之内)。所以,根据句意,选D【参考译文】在引言中,教授解释了课堂上将涉及的主要概念