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?

yet 为副词,可以与though 或although 连用,而however 虽然也可以作副词,但却不这样使用。如果实在理解不了,那就当做一个规则记住吧。good luck !

就像though 不能和but连用一样 however也是转折的意思 同though重复了 所以不能选

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