请看两道题：

(1) It _______ we had stayed together for a couple of weeks _______ I found we had a lot in common.

A. was until; when                                  B. was until; that

C. wasn’t until; when                              D. wasn’t until; that

答案为D。此题考查not…until…句式的强调形式——It was not until…that…的用法。注意不要想当然地将其中的that换成when。

(2) It was not until she got home _______ Jennifer realized she had lost her keys.

A. when                                                  B. that 

C. where                                                 D. before

答案为B。考查not…until…的强调形式，其基本结构为it was not until….that…形式。