This problem is said _______ three times, but he still can’t understand it.A．to

题干

This problem is said _______ three times, but he still can’t understand it.

A．to have been explaining	B．to have explained
C．having been explained	D．to have been explained

上一题下一题 0.85难度单项选择更新时间:2013-10-25 10:06:18

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