单项选择题

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

A．we changed
B．have we changed
C．did we change
D．we have changed
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单项选择题
--Don't you believe me--______, I'll believe ______ you say.
A．No; whatever
B．Yes; no matter what
C．No; no matter what
D．Yes; whatever
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