问题补充：
It was not until she got home Jennifer realized she had lost her keys.
A. when
B. that
C. where
D. before
答案：
A. when
(答案→)B. that
C. where
D. before
解析：句意：直到到家，珍妮弗才发现钥匙丢了。本题考查not until 在强调句中的运用，只把not until放在被强调部分即可，此句还可以改为：Jennifer didn’t realize she had lost her keys until she got home.
