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The boy failed the exam again,and ____ cost his parents many

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The boy failed the exam again,and ____ cost his parents many sleepless nights
为什么用that,不用which
The boy failed the exam again,and ____ cost his parents many
that 在这里是个指示代词, 代替前文The boy failed the exam again这回事
因为有并列连词and, 不可能把后面一句理解为定语从句, 所以不可能用关系代词which

如果用which, 除非把and 去掉
The boy failed the exam again,【which】cost his parents many sleepless nights