问题
选择题
In order to _____ the rising production costs, the subscription rates have been increased.
A．add up to
B．look up to
C．come up with
D．keep up with
答案
答案：D
D.考查动词短语意识辨析。 keep up with跟上。add up to合计，总计是；;look up to赞美，尊敬；本题中rates意为“价格，费用”。come up with 提出，找到，产生。
依据句意“为了跟上生产成本的上升，预定费已提高。”故选D