-MrHu,canyoutellushowtolearnmathwell? -Sure.Butremembe...

問題詳情：

 -Mr Hu, can you tell us how to learn math well?   -Sure. But remember nothing can be learned______ hard work.  A. by  B. a  C. without  D. for

【回答】

C

知識點：介詞和介詞短語

題型：選擇題