Wind power is an ancient source of energy we may return in the near future. A．on which B．by which C．...
2022-12-21 23:11:34 12次 2012-2013学年云南省景洪市高三上学期期末考试英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
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
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