SAT语法题( ) in a museum with such an extensive collection,they

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SAT语法题
( ) in a museum with such an extensive collection,they had a difficult time deciding how to make the most of the limited time they could spend there.
为何Never before having been 正确但是Never before had they been 不正确?

never before having been in a museum with such an extensive collection 是一个以having为核心的分词短语,做句子的状语.
never before had they been in a museum with such an extensive collection 是一个以否定词开头的完整的倒装句（主语是they,谓语是never had been）.
在题目中,collection的后面是逗号,逗号后面是个完整的陈述句,所以逗号前不能再写成完整的句子了（英语里不允许用逗号连接两句话）,只能写成短语或从句,因此...having been...是正确的.

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