It was not until midnight they reached the camp site.A. that B. when C. while D.

It was not until midnight      they reached the camp site.

A. that              B. when               C. while          D. as

试题答案

 A  

解析本题考查not until的强调句型。It is /was  not until …… that ……

hey didn’t reach the camp site until midnight.(not…until 句型)
Until midnight they didn’t reach the camp site.
Not until midnight they did reach the camp site.
Not until midnight did they reach the camp site.（倒装句）
It was not until midnight that they reached the camp site.（强调句）