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A
after
B
before
C
when
D
since
正确答案 :B
解析
本题考查固定句式。
句意为“有很长时间我才弄清经理发生了什么。”这句话用了固定句型:It was+一段时间+before+从句,表示“过了很长时间才/就……”如果是It is+一段时间+since...,自从……有多久了,故选B。
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