There is nothing to gain of course ___ waiting.No pains,no gains.A.with B.of C.by D.in

问题描述:

There is nothing to gain of course ___ waiting.No pains,no gains.A.with B.of C.by D.in
为什么选C?

C.by
by doing sth "通过做某事“ 表方式,手段
翻译:靠等待当然是会一无所获的.有努力,才会有收获啊.