the physics problem remained cofusing to the boy although ov

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the physics problem remained cofusing to the boy although over and over
A explained B having explained
为什么不能选B

根据原句应该是：
这道物理题仍旧困扰这个男孩,尽管他已经被一遍一遍的解释了.
这里boy和explain应该是被动关系,having explained 实际是have explained的现在分词形式,现在分词做伴随状语时,boy和 explain就成了主动关系,所以不对.
过去分词作伴随状语才说明boy和explain是被动关系.
故选A
再问：为什么这里的主语是boy，而不是the physics problem.而且having explained可不可以是问题一次次被解释
再答：先明确一下，这个空是在哪？你说的也有可能，可能是the physics problem，这也一样，它跟explain也是被动关系，仍然要用过去分词做伴随状语。对，可以那么翻译。
再问： the physics problem remained cofusing to the boy although ____ over and over 那如果说要用完成时，必须加having been explained 为什么been不能省略。若是这个problem 作主语，主句和从句主语一致为什么不能省略，他表示的也是被动
再答：那这个explain是跟physics problem相连接的。给你纠正一下，这里不存在主从句的关系，句中：although explained over and over伴随状语。因为although后面没有主语，所以这并不是让步状语从句，只是伴随状语而已。如果用现在完成时，那么就得是having been explained。同样因为problem和 explain 是被动关系

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