有点小疑惑------many times,he still could

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有点小疑惑------many times,he still could
-----many times,he still could not understand it.
A Having been told
B He had been told
CThough he had been told（Though he was told）
DHaving told
知道B,D不对,但为什么不选C?

这里考察三点,

被动语态用法
状语从句用法

代词做主语时的用法：因为主语he在后半段已经使用,在前半句做状语从句时主语即后半段的he,C中主语重复出现,所以错误

有点小疑惑------many times,he still could （）many times,but he still could not understand it. ( )many times, but he still could not rem ______ many times,he still could not understand it. ___ many times but he still could not understand it.(tell) ( ) many times,but he still couldn't remember . ________ many times,he still made the same mistake． ____ many times but he still couldn't understand it 1.__________(tell) many times,he still couldn't understand. —— many times,I still could not understand how to operate th he had been told many times but he still couldn't understand ____ many times ,he still couldn't remember it.求详解