7. (单选题) _____ scores of times ,but he still couldn’t understand it .(本题2.0分) A、 A Having explained B、 B Having been explained C、 C Though it was explained D、 D It was explained

7. (单选题) _____ scores of times ,but he still couldn’t understand it .(本题2.0分)
A、 A Having explained
B、 B Having been explained
C、 C Though it was explained
D、 D It was explained

出自：东北林业大学-大学英语3

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