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
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