Question

(2010·上海)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

Answer 1

C

考查“介词＋which”引导的定语从句。表示“重新回到……上”要用return to。which替代的是先行词“an ancient source of energy”。句意：风能是一种古老的能源，在不久的将来我们可能要重新利用这种能源。