in school we never give a child a chance to find out his mistakes for himself,let[letting]alone corr

题目

in school we never give a child a chance to find out his mistakes for himself,let[letting]alone correct[to correct] them.We do it[those] all for him.为什么不能用括号内的那些词呢?

答案

let 在此与give 等同,相当于：we never let alone correct them.
it 是指find out mistakes for himself,let alone correct them 这件事.