问题
选择题
This problem is said _____ three times.
A．having discussed
B．to have been discussed
C．having been discussed
D．to have discussed
答案
答案：B
题目分析：考查句型：Sb/Sth is said to have done,某人某物据说已经做了…，因为problem和discuss是被动关系，用不定式完成式的被动，句意是：这个问题据说已经讨论了三次了。选B。
点评：Sb/Sth is said to have done表示不定式的动作在句子的谓语动词之前发生，如果是将要发生就用Sb/Sth is said to do.