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