His father began to work _______his childhood.A.since B,as early as C,while 为什么选B,这道题和下面的句子有什么不同Since her childhood,she has always tried her best to live up to her ideas.

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Hisfatherbegantowork_______hischildhood.A.sinceB,asearlyasC,while为什么选B,这道题和下面的句子有什么不同Sinceherchildho

His father began to work _______his childhood.A.since B,as early as C,while 为什么选B,这道题和下面的句子有什么不同Since her childhood,she has always tried her best to live up to her ideas.
His father began to work _______his childhood.A.since B,as early as C,while
为什么选B,这道题和下面的句子有什么不同
Since her childhood,she has always tried her best to live up to her ideas.

His father began to work _______his childhood.A.since B,as early as C,while 为什么选B,这道题和下面的句子有什么不同Since her childhood,she has always tried her best to live up to her ideas.
since可以看做完成时的标志,题目中没有明显的完成时态