The research team is said______another important discovery in physical chemistry

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问题 The research team is said______another important discovery in physical chemistry.

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

答案 C

解析这是一道语法题，考点是动词不定式完成时的用法。to have made表示“已经做出”。

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Treesareusefultomaninthreeimportantways:theyprovidehimwithwood