One learns a language by making mistakes and them.
A. correct
B. correcting
C. corrects
D. to correct
网友回答
A. correct
(答案→)B. correcting
C. corrects
D. to correct
解析:本题考查动名词作介词宾语的用法。介词by意为“通过……,凭……”,后面常接动名词,形成“by+ v. –ing ”结构,表示通过做某事而得到某种结果。本题中只有correcting符合。