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

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

A. a great deal of(答案→)B. a good manyC. a good amount ofD. 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。

这个解释是对的