It was not until midnight ____ the snow-capped peak.

It was not until midnight ____ the snow-capped peak.
A、that they sighted
B、that they did not sight
C、did they sight
D、had they sighted
【正确答案】：A
【题目解析】：It was not until...that...直到...才....
句意：直到午夜他们才看到那座白雪覆盖的山峰。