Question

Not until all the fish die in the river ____ how serious the pollution was.

A．did the villagers realize	B．the villagers realized
C．the villagers did realize	D．didn’t the villagers realize

Answer 1

A

试题分析：考查部分倒装句，not until放在句首时，从句不倒装，主句部分倒装，把助动词，be动词或情态动词提到主语前面。句意：直到河里的鱼都死了，村民才知道污染是多么严重。选A。
点评：以否定副词开头并加状语放在句首的句子要求部分倒装。这些否定副词有barely, hardly, little, seldom, scarcely…… when, never, no sooner…… than, rarely, no more, not nearly, not only等以及only。