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Mary liked to look back on her high-school days. she thought were the happiest i

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Mary liked to look back on her high-school days. she thought were the happiest i

Mary liked to look back on her high—schooldays,     she thought were the happiest in her life.

  A.that    B.what    C.which D.when

 

 

试题答案

【答案】

C

【解析】略