Not until all the fish died in the river _____ how serious the pollution was.
A．did the villagers realizeB．the villagers realized
C．the villagers did realizeD．didn't the villagers realize
A
考查倒裝句。Not until放在句首時(shí)，后面的主句使用部分倒裝句。結(jié)合句意可知A正確。句意：直到河里所有的魚(yú)都死了，村民們才意識(shí)到污染是多么的嚴(yán)重。
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