Work cannot take the indefinite article (a) in this sense: He has a lot of work to do. I don't enjoy such work. Work can take the indefinite article when a piece of art is meant: This painting is a real work of art!
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fireflysaigonthe answer is "D. job". I don't know whyThe combination "do a good work" is impossible when it means "do well" (on a given task). The correct idiom is "do a good job".