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

The boy failed the exam again,and ____ cost his parents many tom failed the exam again,___his parents would David failed the exam again the poor boy failed the English exam again.=the poor boy()() Tom failed ( ) (pass) the Chinese exam again. 选择题john,you failed the exam again. You might （） your parents if you failed the exam again. You might ____your parents if you failed the exam again. A b you might _____ your parents if you failed the exam again 高一的句型转换!1.the fact that he failed the exam made his parents I failed in the exam again,and the d____ look on my father's The boy failed ___ (keep) his room clean and tidy.