题目内容

Only when the villagers were faced with water shortage___       how serious the problem of water pollution was.
A.did they realizeB.will they realizeC.they did realizeD.were they realized
A
句意:只有在村民面临水资源短缺形势时,他们才意识到水污染是多么严重。考查Only+when从句放在句首时,用部分倒装。
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