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

She followed the receptionist down a luxurious corridor to a closed door, _____ the woman 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 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 分析句子结构可知，逗号后的从句为非限制性定语从句，修饰先行词a closed door，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。wherein相当于in which place，搭配的介词不对，可排除A。but连接表转折的并列句，前后分句之间意思不存在转折，且并列句不需要再加从句引导词when，故排除C。D项then不能连接并列句，若要选D。需要在then前加and，故排除D。
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