She followed the receptionist down a luxurious corridor to a closed door, ________the women gave a quick knock before opening it

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

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

答案B

解析 本题考查非限制性定语从句的引导词。分析句子可知,逗号前的句子结构完整,逗号后的句子是一个非限制性定语从句,修饰a closed door。句末的it指的是a closed door,由before opening it可知,敲的对象closed door,将这部分补充完整即give a quick knock on the closed door。因此,定语从句的关系词在从句中作介词on的宾语,故答案为B项。wherein意为“在其中”; then意为“然后”,均不能引导定语从句,故排除。but when放在此处语义不通,故排除。
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