问题
选择题
Professor Smith is said _____ another important discovery in chemistry.
A．having made
B．making
C．to have made
D．to make
答案
答案：C
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Professor Smith is said _____ another important discovery in chemistry.
A．having made
B．making
C．to have made
D．to make
答案：C
是一种医药中间体，常用来制备抗凝血药，可通过下列路线合成：