They had a number of suggestions about ______the service of the restaurant should be improved.
问题描述：
They had a number of suggestions about ______the service of the restaurant should be improved.
A.what B.whether C.how D.where
为什么选c B 为什么不可以?
答
选C句子的意思是；关于餐馆的服务如何（C）改进,他们提了多条建议,如果选B句子的意思则是；就餐馆的服务是否（B)需要改进,他们提了多条建议,显然选B不符合实际情况,改进服务是必然,只是如何改进,