His father began to work___ his children A since B before C as early as D while

His father began to work___ his children A since B before C as early as D while

题目
His father began to work___ his children A since B before C as early as D while
答案
同学,你打错了.我们刚刚才做了这道题.
最后是his childhood.
这句话的意思是,他的爸爸从他童年开始就开始工作了.
as early as,是自……以来的意思.
所以选C.
不能选while,它是连词,后面不能跟宾语.
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