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

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

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