___ several times,but he still doesn't know how to use the c

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___ several times,but he still doesn't know how to use the cleaner.
a.Having been shown b.I have shown him 为什么用B不用A

是选B
给你简单说说：
楼主选A的解释应该是（现在）分词做状语,但请看后面还有一个but.按楼主的思路,此句应为：
Having been shown several times,he still doesn't know how to use the cleaner.对吧,不能有but.
所以此处就是一个简单的but转折句.
“我和他说了好多次,但他仍然不知道怎样用清洁器.

___ several times,but he still doesn't know how to use the c 语法 ___several times,but the boy doesn't know how to answer t use, how,he,Internet,the,doesn't,to,know 连词成句 I rang the doorbell several times but couldn't ___ anyone he she doesn't know how to use the recorder.改为同义句she doesn't kn she doesn't know how to use the recorder.同义句：she doesn't kno having been told mang times ,he still didn't know how to do Having been told many times,he still didn’t know how to do i _many times,the boy still didn't know how to do the exercise I 've told him several times but he ____ doesn't understand He read the paper several times but be still（）some printer’ .He read the paper several times but be still _______ some p