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Who did it is still a mystery,为何这句没连接词呢?

题目详情
Who did it is still a mystery,为何这句没连接词呢?
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答案和解析
(who did it)是一个主语从句,is是be动词,后面接的是名次,整句的意思局势,“”是谁做了这件事还是个秘“”