Peter was about to unlock the door ____he found someone had broken into the room.（ ）
- A.than
- B.before
- C.once
- D.when
正确答案及解析
正确答案
D
解析
此题考查四个连词的区别。根据词义应该选D，即when这时，此刻。
Peter was about to unlock the door ____he found someone had broken into the room.（ ）
此题考查四个连词的区别。根据词义应该选D，即when这时，此刻。
