It was not until she got home ________ Jennifer realized she had lost her keys．

A.when

B.that

C.where

D.before

答案及解析： B

句意“直到到了家，詹尼弗才发现钥匙丢了”。在高中英语中not 和until只能在两种情况下紧挨着出现：①强调句型中；②倒装句型中。其他情况一律用not…until，所以此句还可以改写为：Jennifer didn’t realize she had lost her keys until she got home．/Not until she got home did she realize she had lost her keys．