（）many times,but he still could not understand it.

分类: 作业答案 • 2021-12-02 10:29:36

问题描述：

（）many times,but he still could not understand it.
A:Having been told B:He had been told 为什么选B不选A,

答

选A的话,“but”前的句子缺少主语成分.but是连词,连接两个并列的句子,要求两个句子的成分都要完整.如果去掉but就可以选A了.