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

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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,a great deal of修饰不可数名词。work是不可数名词,故选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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