(4分)It is useful to be able to predict the extent ______ which a price change will affect supply and demand. A. from B. to C. for D. with

(4分)It is useful to be able to predict the extent ______ which a price change will affect supply and demand.
A. from
B. to
C. for
D. with

出自：兰州大学-大学英语3

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