It was not until she got home Jennifer had realized she had lost her keys.A. whereB. thatC

问题补充：

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

A. where

B. that

C. when

D. before

答案：

A. where

(答案→)B. that

C. when

D. before

解析：这是强调句型，其结构是：It was+被强调部分+that/who+其他。判断强调句型的方法是把It was that这三个词去掉，整个句子不缺成分，意思完整。当被强调部分是until+状语时，要把主句中的not一起放在被强调部分。故选B。