Not until all the fish died in the river,( ) how serious the pollution was

Not until all the fish died in the river,( ) how serious the pollution was

题目
Not until all the fish died in the river,( ) how serious the pollution was
A did the villagers realize B the villagers realized C the villagers didi realize D didn't the villgeers realize
答案
A 倒装句,由not until提前的句子,从句要用倒装语序,而且不用否定形式.
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