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

游客2023-10-24  36

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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