【题目】— How much do you charge for the iPhone?
— Well,it cost me $ 400,but I’ll ________ 20% as it’s no longer new.
A. reduce to B. decrease to
C. knock off D. cut off
在线课程【答案】C
【解析】考查短语辨析。A. reduce to减少至；B. decrease to 降低至；C. knock off减少；D. cut off切断，剪下。题意为"因为手机不是新的，所以价格减少20％"。故选C。