问题
选择题
_____ 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
答案
答案：D
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_____ 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
答案：D