The　maths problem remained confusing to the boy although EXPLAINED over and　over.这句是THE BOY是EXPLAINED的宾语,然后不及物动词无被动,不知是否有错``````

explain是及物

那么这个句子怎么解释??谢谢

这个数学问题虽然被从头到尾解释了一遍又一遍，这个男孩却还是对它感到困惑

是语法解释为什么用EXPLAINED而不用不定式

被解释,(being) explained

#5although EXPLAINED over and　over. 这句实际上的省略句,其完整形式为:Although it had been explained over and over.it 指代 maths problem, 也就是说,maths problem 是 explain的宾语

THANKS

The　maths problem remained confusing to the boy although EXPLAINED over and　over. =The　maths problem remained confusing to the boy although (he had been)EXPLAINED over and　over. 我觉得主句是The　maths problem remained confusing to the boy ．although (he had been)EXPLAINED over and　over. 是状语省了he had been直接用过去分词来做状语，有什么分词前可以加个连词，比如这的although

有时候分词前可以加个连词，比如这的although