The repairperson could not find the specific problem_______had caused the computer to crash．

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问题 The repairperson could not find the specific problem_______had caused the computer to crash．

选项 A、how
B、whom
C、what
D、that

答案D

解析通过分析句子结构，空格前为主语+动词+宾语的结构，因此空格以后的都必须为修饰先行词problem的关系代词从句。

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