Windpowerisanancientsourceofenergy

问题详情：

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

【回答】

解析：考查“介词＋which”引导的定语从句的用法。句意：风能是一种古老的能源，我们在不久的将来可能会重新利用它。return to sth.“回归到……”。

*：C

知识点：定语从句

题型：选择题