Not until the train pulled into the station --- that the suitcase was gone.A.did he find B.had he found C.he had found D.he found选哪个啊 为什吗

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Not until the train pulled into the station --- that the suitcase was gone.
A.did he find B.had he found C.he had found D.he found
选哪个啊 为什吗

选C.过去完成时态.因为这是一个典型的not until置前的条件式强调句.
not其实是对主句的谓语动词的否定,而且是在条件从句发生之前就已经存在的事实,所以主句要用过去完成时态.
这种结构中的主句只能用陈述句,所以其它的都不对.