问题
选择题
| Wind power is an ancient source of energy _____ we may return in the near future. |
A. on which B. by which C. to which D. from which |
答案
答案：C
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| Wind power is an ancient source of energy _____ we may return in the near future. |
A. on which B. by which C. to which D. from which |
答案：C