问题详情：
(2011年浙*金华十校联考)Not until the press reported the pollution________why the water supply had been cut off.
A．people did know B．people had known
C．had people known D．did people know
【回答】
解析：选D。考查倒装句和时态。Not until置于句首时，主句要用(部分)倒装结构，由此可以排除A、B两项；另外，根据reported可知C项时态不正确。
知识点：倒装与省略
题型：选择题
