This problem is said _____ three times.
A．having discussedB．to have been discussed
C．having been discussedD．to have discussed
B

試題分析：考查句型：Sb/Sth is said to have done,某人某物據(jù)說已經(jīng)做了…，因為problem和discuss是被動關(guān)系，用不定式完成式的被動，句意是：這個問題據(jù)說已經(jīng)討論了三次了。選B。
點評：Sb/Sth is said to have done表示不定式的動作在句子的謂語動詞之前發(fā)生，如果是將要發(fā)生就用Sb/Sth is said to do.
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