问题补充:
It was not until midnight they reached the camp site.
A. that
B. when
C. while
D. as
答案:
(答案→)A. that
B. when
C. while
D. as
解析:句意:他们直到半夜才到达宿营地。本句考查强调结构,可以还原为:They didn’t reach the camp site until midnight. 这是含有until引导状语从句的强调句型。当强调 until从句部分时,应注意把not一起提前。即:It is/ was not until + 被强调部分 + that + 其它部分。