Question

【题目】昨晚我妈妈直到半夜才睡觉。
midnight my mother went to bed last night.

Answer 1

【答案】It；was；not；until；that
【解析】此处是not until的强调句式，基本结构为：It is/was+被强调部分+that，所以答案是It was not until ... that。