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.
There is nothing to gain of course ___ waiting.No pains,no gains.A.with B.of C.by D.in
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?
为什么选C?
英语人气：215 ℃时间：2020-06-27 10:22:33
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