核心问题
（1）A great many of men were killed. A B C D (2) He seems to have a great deal money. A B C D
我看不出上面的句子有什么错误。
词典解答
应当记住，a great(good) deal 之后要跟个介词 of 才能与名词连用，而 a great(good) many 却可不用介词 of，而直接与名词连用。如与 of 连用，则 of 之后的名词必须是有定的（带有定冠词等限定词）或者用代词来代替，如 a great(good) many of the teachers/them。另外，还要记住，a great(good) deal of 跟不可数名词连用，而 a great(good) many 则与可数名词连用。例如：
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The chest contained a great(good) deal of money. (CGEL) 这个柜子装有许多钱。
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He has given me a great deal of help. 他给了我很多帮助。
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It seems there are a good many people out of work. (Galsworthy) 好像有许多人失业。
另外，a great deal 还可用作形容词或副词比较级的修饰语：
That job was a great deal easier. (CGEL) 这个工作容易得多。
a great deal 亦可用作副词,修饰动词:
I like him a great deal. (CGEL) 我很喜欢他。
(参见 deal )