She followed the receptionist down a luxurious corridor to a closed door, _____

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问题 She followed the receptionist down a luxurious corridor to a closed door, _____ the woman gave a quick knock before opening it.

选项 A、wherein
B、on which
C、but when
D、then

答案 B

解析逗号后的从句为非限定性定语从句，修饰先行词a closed door，表达“敲门”的介词搭配为give a knock on a door，把on a door提前引导从句，将a door替换成which，就变成了on which，故选B。

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