Nobody knows how he was murdered but people behind the scenes can guess why. A. a great

问题补充：

Nobody knows how he was murdered, but people behind the scenes can guess why.

A. a great deal of

B. a good many

C. a good amount of

D. a great many of

答案：

A. a great deal of

(答案→)B. a good many

C. a good amount of

D. a great many of

解析：句意: 谁也不知道他是怎样遇害的，但不少知道内情的人却能猜测出他遭受杀害的内中缘由。people为复数名词，所以只能选能接复数名词a good many，B项为正确答案。a great many of后接的名词必须是限定的复数名词；A、C后只能接不可数名词。