Not until all the fish die 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

試題分析：考查部分倒裝句，not until放在句首時，從句不倒裝，主句部分倒裝，把助動詞，be動詞或情態(tài)動詞提到主語前面。句意：直到河里的魚都死了，村民才知道污染是多么嚴(yán)重。選A。
點評：以否定副詞開頭并加狀語放在句首的句子要求部分倒裝。這些否定副詞有barely, hardly, little, seldom, scarcely…… when, never, no sooner…… than, rarely, no more, not nearly, not only等以及only。
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