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(shuō)已經(jīng)做了…，因?yàn)閜roblem和discuss是被動(dòng)關(guān)系，用不定式完成式的被動(dòng)，句意是：這個(gè)問題據(jù)說(shuō)已經(jīng)討論了三次了。選B。
點(diǎn)評(píng)：Sb/Sth is said to have done表示不定式的動(dòng)作在句子的謂語(yǔ)動(dòng)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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