Question

【题目】I can never understand the reason _______ he explained to me.

A.whyB.thatC.whenD.where

Answer 1

【答案】B

【解析】

考查定语从句。句意：我不明白他向我解释的原因。分析句子可知，此处是定语从句关系词，先行词reason在从句中充当explain的宾语，应用关系代词which/that，故选B项。