Question

 (2011年浙江金华十校联考)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

Answer 1

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。