The price of the radio , and I don’t know the reason. A. went upB. has gone upC. had gone

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A. went up
(答案→)B. has gone up
C. had gone up
D. will go up
解析：考查固定结构与时态相结合的应用。题意为：收音机的价格上涨了，我不知道其中的原因。go up 意为“上升，上涨，上扬”，从后句中的don’t know 可知降价与现在时态有关系，即对现在有影响。故选B。