题文
It is useful to be able to predict the extent _______which a price change will affect supply and demand.
| A．from |
| B．with |
| C．to |
| D．for |
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It is useful to be able to predict the extent _______which a price change will affect supply and demand.
| A．from |
| B．with |
| C．to |
| D．for |
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