题目

- The reason_________ he didn't come was _________ he had to take care of his sick mother. A. why; that                   B. why; which    C. which; why                  D. that; for 答案：A 解析: 本题是一道定语从句与宾语从句的交叉考查。why引导的从句作为句中的定语，that引导的从句作为句中的宾语。

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