______work has been done to improve people’s living standard.A、ManyB、A great ma

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问题 ______work has been done to improve people’s living standard.

选项 A、Many
B、A great many
C、A large number of
D、A great deal of

答案 D

解析 many，a great many和a large number of都是修饰可数名词复数形式的；a great deal of修饰不可数名词。work是不可数名词，所以选D。句意：为提高人们的生活水平已经做了很多工作了。

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