____over and over again,but the old man still couldn`t under

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____over and over again,but the old man still couldn`t understand.
A.Having explained B.Having been explained C.Explained D.It had been explained
我选的是A,这不是一个完整的句子啊,中间无连词怎还用It的形式?

首先有but 就说明前后是两个句子句子一定要有主语选A没主语了.但是选A的话可以改成这样Having been explained over and over again,the old man still couldn`t understand.因为没but 前后可以共用一个主语 the old man.

____over and over again,but the old man still couldn`t under 几道英语选择题1.____ over and over again ,but he still couldn't und when he saw his lost son again ,the old man couldn't help _j ( ) old man under ( ) tree is over 90 years old.A.An,the B.T the old man thanked me again and again 中的 again and again They searched the mountain but still couldn't find the_____b what is both over and under the water but doesn't touch wate 高中英语单选几道.1.________A_ many times,but he still couldn’t under The man is very old,But he still works hard. Again and again the doctor __ the crying girl,but he couldn' The old woman ____ and couldn't find her house. I read through the letter again and again but still found___