问题
选择题
It is useful to be able to predict the extent _____ a price change will affect supply and demand.
A．fromwhich
B．withwhich
C．towhich
D．for which
答案
答案：C
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It is useful to be able to predict the extent _____ a price change will affect supply and demand.
A．fromwhich
B．withwhich
C．towhich
D．for which
答案：C