During the 1950s，R&.B changed modern music further and led to＿＿＿＿we know as rockand roll.
A. as
B. what
C. that
D. which
网友回答
A. as
(答案→)B. what
C. that
D. which
解析：此处what we know as rock and roll.作to的介词宾语，what在宾语从句中作know的宾语。选项as正如……；that引导名词性从句，不作成分，没有意思；which意为：哪一个，根据句意此处没有这个意思。句意：在20世纪50年代，R&.B进一步改进了现代音乐，从此产生了众所周知的摇滚。