问题补充:
It was not until mid-night they reached the camp site.
A. that
B. when
C. while
D. before
答案:
(答案→)A. that
B. when
C. while
D. before
解析:考查强调句型。本题强调的是时间状语not until mid-night;句意:直到半夜,他们才到达宿营地。故A正确。要注意如果不使用强调句型,Not until mid-night did they reach the camp site。要使用部分倒装句。