After _seemed like hours,the big fire was finally brought under control.A.which B.it C.what D.that正确答案是C,不懂为什么,我自己选的是B

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After _seemed like hours,the big fire was finally brought under control.A.which B.it C.what D.that正确答案是C,不懂为什么,我自己选的是B
After _seemed like hours,the big fire was finally brought under control.
A.which B.it C.what D.that
正确答案是C,不懂为什么,我自己选的是B

After _seemed like hours,the big fire was finally brought under control.A.which B.it C.what D.that正确答案是C,不懂为什么,我自己选的是B
好问题.
简单的解释是,在这个情况下,what 代表 "that which" 或 "something which" 的意思.用 what 而不用其他两个词语比较简洁.

after是介词,后面跟宾语从句,而宾语从句缺主语,所以what 来引导宾语从句。