請看兩道題：

(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

答案為D。此題考查not…until…句式的強調形式——It was not until…that…的用法。注意不要想當然地將其中的that換成when。

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

A. when                                                  B. that 

C. where                                                 D. before

答案為B�？疾�not…until…的強調形式，其基本結構為it was not until….that…形式。