2. 外语
  3. ______the introduction, the professor explained the major concept that would be covered in the class.

______the introduction, the professor explained the major concept that would be covered in the class.

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问题 ______the introduction, the professor explained the major concept that would be covered in the class.
选项 A、By
B、Like
C、For
D、In
答案D
解析 本题考查介词辨析。句意：在引言中，教授解释了课堂上将涉及的主要概念。by“通过，依据”；like“像，如同”；for“为了，对于”；in“按照，在……之内”。根据句意，本题选D。
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