_____ scores of times , but he still couldn’t understand it ．A．Having explainedB

题干

_____ 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

上一题下一题 0.85难度单项选择更新时间:2010-05-26 09:33:52

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