Question

_____manners are very important in every country is known to all，but the trouble is that different countries have different ideas about ______good manners are.

A. That；what B. That；that

C. What；that D. What；what

Answer

A

【解析】

考查主语从句和宾语从句。逗号前有两个谓语动词，一个是are, 一个是is known, 故是两句话，需填连词连接这两句话，根据句意可知，前面是主语从句，故填that ，此处的that,只起连接作用不作任何成分。about是介词，其后是个句子故应填连词把这两句话连接起来，所缺词作are的表语，故填what。句意为：众说周知，礼貌在每一个国家中都是非常重要的，但是麻烦是，不同的国家对于什么是良好的礼貌有着不同的认识。故选A。