Not until the press reported the pollution _________ why the water supply had been cut off.
A．people did knowB．people had known
C．did people knowD．had people known
C

試題分析：not until 位于句首，句子使用部分倒裝。排除ＡＢ，Ｄ答案時(shí)態(tài)不對。句意：
直到新聞報(bào)道了污染人們才知道為什么水的供應(yīng)被切斷。
點(diǎn)評：倒裝分為部分倒裝和完全倒裝。要分清他們的概念及使用規(guī)則。部分倒裝是把部分謂語（ｂｅ動(dòng)詞／助動(dòng)詞／情態(tài)動(dòng)詞）提到主語前面，完全倒裝是把整個(gè)謂語提到主語前面。
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