They prepared manmade rubber as a substitute________ the natural rubber that th
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| They prepared manmade rubber as a substitute________ the natural rubber that they could no longer obtain. |
答案
| for |
解析
| 句意：他们用人造橡胶替代无法再获取的天然橡胶。substitute“代替品”后接for，与句意相符。 |
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