问题描述：
Which of the following represents "Subtract a from b,then multiply the result by 4"?
A.b-4a
B.a-4b
C.4(a-b)
D.4(b-a)
A.b-4a
B.a-4b
C.4(a-b)
D.4(b-a)
问题解答：
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