Not once in these years ______ the prices of these products.

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问题 Not once in these years ______ the prices of these products.

选项 A、we changed
B、have we changed
C、did we change
D、we have changed

答案B

解析否定词+倒装结构，例：Not once did he talk to me．意为：他一次也没有和我谈过。本题题意是：这些年我们一次也没有改变产品的价格。故本题答案为B。

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