英语翻译

题目

英语翻译
the silt that had been moved by the boy began to once more fall to the bottom
that在句子里做什么成分
once在句子里什么意思
不对，是once more 为什么放在began to和fall之间

答案

that引导主语同位语从句
once more作状语,放前放后都没问题,即可改为：
The silt that had been moved by the boy began to fall to the bottom once more.