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 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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