By the time he was 10,he ____(make) a living by selling news

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By the time he was 10,he ____(make) a living by selling newspapers.
By the time he was 10,he ____(already make) a living by selling newspapers.答案是was already making
可by不都是用完成时的吗?应该是过去完成时才对啊?
By the time 能用进行时吗,

答案是正确的
1.是讲他was十岁的时候,基本时态是过去式.
2.讲的是他十岁那一个阶段一直靠卖报纸赚钱,所以用进行式

By the time he was 10,he ____(make) a living by selling news By the time he was twelve,Edison（） to make a living by himse By the time he was twelve,Edison had began to make a living 1.When he was young ,he made a living by selling ______(报纸）. He makes a living ____ selling newspaper.A.in B.for C.by D.w He e______ his living by selling shares. by the time 空格 he was ten years old ,he had begun to make a they are 【against】 make a living by selling flowers 和He makes a living by selling vegetables是同义句是什么 Mr Brown makes a living ____ selling newspapers when he was The boy m___ a living by selling newspapers. Tony was t____(使非常激动) by the good news that he got an "A" in