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：只有在村民面臨水資源短缺形勢時(shí)，他們才意識到水污染是多么嚴(yán)重�？疾镺nly+when從句放在句首時(shí)，用部分倒裝。
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