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

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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. (2017)

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

答案 A

解析 2017年第12题。复合句连词。空格前后分别是一个简单句，因此可以先排除B。D项then为副词，不能连接句子，必须增加连词形成and then结构才能连接两个简单句，故排除D。C项wherein是副词，意为“在那里，在其中”，不符合句意，如：This is a riding school wherein(=in which place)we could learn the art of horsemanship．A选项on which是“介词+关系代词”引导的非限制性定语从句，which指代主句中的a closed door，介词on在从句中和动词搭配，gave a quick knock on the door，故正确答案为A。

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