英语作业帮助whenthechildrenare(tooyoun
when the children are (too young to)此为A walk (that)此为B far , their mothers (ta turn )此为C(driving)此为D them to school. 找错题, 另外, THAT 在这里充当什么成分, 是什么意思. 
C driving 改成to drive吧 that 在这里表示一种程度,有点so ,such的味道