Not until all the fish died in the river ______ how serious the pollution was.
A．the villagers did realizeB．the villagers realized
C．did the villagers realizeD．didn’t the villagers realize
C
考查倒裝句。否定詞放在句首主句使用部分倒裝，助動詞提前，句意：直到河里所有的魚都死了，村民們才意識到污染是多么的嚴重呀。根據(jù)語境選C。
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