It was while she was sleeping in her bedroom ____ a thief broke into the house拜托了各位 谢谢

问题描述:

It was while she was sleeping in her bedroom ____ a thief broke into the house拜托了各位 谢谢
It was while she was sleeping in her bedroom ____ a thief broke into the house A. which B. that C. where D. than此句为强调句型,我觉得应选B,但答案是A,到底选哪个呢

选B,此乃It's that.句型,中间while she was sleeping in her bedroom 是插入语.