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After ____ seemsd a long time,he managed to work out this pr

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After ____ seemsd a long time,he managed to work out this problem.
A that
B whether
C which
D it
seemed
After ____ seemsd a long time,he managed to work out this pr
朋友,
答案应该是 what.你的四个选项全都不对啊.请你核对一下.
After WHAT seemed a long time,he managed to work out this problem
====He didn't work out this problem until a long time had passed.
what==something that
再问: 哦 是B是what 打错了 谢谢