After------- seemed a long time,they arrived at --------- was called Rugao Middle School.

After------- seemed a long time,they arrived at --------- was called Rugao Middle School.

题目
After------- seemed a long time,they arrived at --------- was called Rugao Middle School.
A.it,what B.what,that C.what,what D.it,which
第二空at介词后跟宾语从句我懂,但第一空为什么After做介词,而不是做连词,做连词的话填it应该可以吧.老师解释过为什么这儿是做介词而不是做连词了,可惜想不起来了,知道的解释下.
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