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题目内容
（延安大学-大学英语1）
_____ scores of times ,but he still couldn’t understand it .(本题3.0分)
A、 A Having explained
B、 B Having been explained
C、 C Though it was explained
D、 D It was explained
A、 A Having explained
B、 B Having been explained
C、 C Though it was explained
D、 D It was explained
参考答案