Peter was about to unlock the door ____h

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问题 Peter was about to unlock the door ____he found someone had broken into the room.（　　）A． than B． before C． once D． when

选项 A． than
B． before
C． once
D． when

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。

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