问题描述：
90.The professor,____as a splendid speaker,was warmly received by the sudents.
A.known
B.to be known
C.knowing
D.having known
请说下考点及解题思路,其他选项为什么不行?
A.known
B.to be known
C.knowing
D.having known
请说下考点及解题思路,其他选项为什么不行?
问题解答：
我来补答展开全文阅读