though he is young ,___knows a lot A yet he B however he 为什么不能选b?
问题描述:
though he is young ,___knows a lot A yet he B however he 为什么不能选b?
答
A yet 虽然有但是的意思 它既可以做连词也可作副词可以和though连用
而however是副词 必须有逗号给开