问题
选择题
It was when she was sleeping in her bedroom __________ a thief broke into the house.
A．which
B．that
C．where
D．than
答案
答案：B
句子去掉It was和__________之后，剩下a thief broke into the house when she was sleeping in her bedroom.是一个完整句子，所以原句是强调句型，选B。