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(2013·宁夏银川一中高三第四次考试)________ scores of times, but he still couldn't understand it. A．Having explaine...
题目内容：
(2013·宁夏银川一中高三第四次考试)________ scores of times, but he still couldn't understand it.
A．Having explained
B．Having been explained
C．Though it was explained
D．It was explained
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