____the teacher came into the classroom,they were arguing

____the teacher came into the classroom,they were arguing

题目
____the teacher came into the classroom,they were arguing
before after until while as 选
答案
应该是when或as,虽然没有when这个选项.因为when和as后的从句可以是一般过去时也可以是过去进行时.而while后面一般是过去进行时.before和until和after一般和完成时用在一起.要用过去完成时.所以选as.
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