In order to _____ the rising production costs, the subscription rates have been increased.A.add up toB.look up toC.cut shortD.keep up with
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D解析keep up with跟上。参阅。88注释。Add up to参阅.2注释；cut short 详见.38;look up to(=admire, respect)赞美，尊敬：We look up to the old workers as our teacher.（我们把这位老工人尊为我们的老师。）本题中rates意为“价格，费用”。本题译文：为了跟上生产成本的上升，预定费已提高。