After______seemed half an hour the teacher gave us the correct answer.A.that B.what C,which D.it为什么选what 不选it?

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After______seemed half an hour the teacher gave us the correct answer.A.that B.what C,which D.it为什么选what 不选it?
After______seemed half an hour the teacher gave us the correct answer.
A.that B.what C,which D.it
为什么选what 不选it?

After______seemed half an hour the teacher gave us the correct answer.A.that B.what C,which D.it为什么选what 不选it?
after是个介词 后面只能是名词、名词性的短语、或者是名词性从句 用B 正好引导了一个名词性从句 而C是It seemed 句型 ,不属于名词一列