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After several days they came to settle down in what is now a holiday center.这个句子中为什么用what?which为什么不对?

题目详情
After several days they came to settle down in what is now a holiday center.这个句子中为什么用what?
which为什么不对?
▼优质解答
答案和解析
what is now a holiday center 是一个宾语从句,宾语从句的引导词只能用what,where,how,why等,不能用which.