________whatyouknowiscorrectbefore

发布时间：2020-07-09 18:49:29

________ what you know is correct before you teach it as a truth.













A.Make sure












B.Make it certain











C.To be sure











D.To be certain

网友回答

C解析本题主要考查句子结构。掌握非谓语动词作主语的形式。
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