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This problem is said _______ three times, but he still can’t understand it.
A．to have been explainingB．to have explained
C．having been explainedD．to have been explained
D

試題分析：句意：這個(gè)問題被解釋了三次了，但是他還是不明白。這里是sth be said to do，故排除C；這里This problem與explain之間是被動(dòng)關(guān)系，故排除AB；根據(jù)句意故選D。
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