though he is young ,___knows a lot A yet he B however he 为什么不能选b?_英语解答

though he is young ,___knows a lot A yet he B however he 为什么不能选b?

人气：417 ℃　时间：2020-01-29 10:48:44

解答

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