Professor Smith is said______another important discovery in chemistry.A、to make

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问题 Professor Smith is said______another important discovery in chemistry.

选项 A、to make
B、to have made
C、having being made
D、having made

答案 B

解析本题考查be said to do的用法。题干大意是：据说史密斯教授在化学领域又做出了一项重要的发现。事情已经发生过了，所以不定式用完成时形式。

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