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一道英文选择题.Professor Smith is said ____another important discov

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一道英文选择题.
Professor Smith is said ____another important discovery in chemistry.
A)having made ,B)having bee made,C)to have made,D)to made
句中is said 被动语态吗?
e said to do 和 be said to have done 是一种固定句式,表示“据说……怎么样”,to do 表示将要做,to have done表示完成