a great many of 后面加可数名词 a great deal of后面既可以加可数名词也可以加不可数名词
1.只加可数的复数
a great many （of）
a good/great many books
a good/great many of my books
a number of=many
2.+不可数名词
a great deal of
an amount of=amounts of
恩，楼上正解，同意，不重复了
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