选B
这句话的意思是“还没等到我意识到画已经丢失就已经有几天过去了”
before 除了有“在……之前”的意思,还有引申为“还没……某事就已经发生”
例句：He had gone before I could say any words.
你理解一下就可以知道这种用法了
as的话,相当于when,虽然意思理解也勉强对,但程度不深,不能把情境体现出来
that 没有这样的用法,
说明选和不选的原因Several days had gone by _____ I realized the paint
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