问题补充：
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：
A. which
(答案→)B. that
C. where
D. than
解析：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。
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