摘要：30．Wind power is an ancient source of energy we may return in the near future. A. on which B. to which C. by which D. from which
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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 |
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 |
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 |