though he is young ,___knows a lot A yet he B however he 为什么

though he is young ,___knows a lot A yet he B however he 为什么 Though he is young,___knows a lot. though he is a child however he konws a lot.哪错了 求：Though he is young, he knows a lot.的倒装句（急!） A______ he is young,he learns a lot. young he is ,he knows a lot about the world Young man as he is,he knows a lot. he is good at subject .though he plays a lot.he is a t______ young as he is ,he knows a lot.这句话前半句为什么要倒着写啊?为什么不是as he is _____he is young,he konws quite a lot _____as he is,he knows a lot. Although/thangh he is young but he knows a lot这个病句怎么改?