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
搜题请搜索小程序“爱下问搜题”
Professor Smith is said _____ another important discovery in chemistry.
A．having made
B．making
C．to have made
D．to make
答案：C