Wind power is an ancient source of energy _____ we may
| 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 |
可能相似的问题
你能帮帮他们吗
| 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 |
你能帮帮他们吗