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一个高一英语疑问Themostexcitingthingforhimwasthathefinallysucceededinseemedtobethemostdifficultexamtohim.答案中说空格处应填what,不能填which,为什么啊?

题目详情
一个高一英语疑问
The most exciting thing for him was that he finally succeeded in ______ seemed to be the most difficult exam to him.
答案中说空格处应填what,不能填which,为什么啊?
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答案和解析
因为这里主句缺少介词宾语,而从句缺少主语.
what 在做连接词的时候,相当于 the thing that,所以用what
记住 what = the thing that