问题
选择题
For many online shops, the price of their products can be decreased _______ 30% in the holiday seasons.
A．to
B．of
C．by
D．on
答案
答案：C
题目分析：句意：对于许多网店来说，在假日他们产品的价格会减少30%。To为了；of属于……的；by相差；on在……上，选C。
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