By the time he was twelve, Edison ________ to make a living by himself .A.would beginB.has begunC.ha

题目简介

By the time he was twelve, Edison ________ to make a living by himself .A.would beginB.has begunC.ha

题目详情

By the time he was twelve, Edison ________ to make a living by himself .
A.would beginB.has begunC.had begunD.was begun
题型:单选题难度:中档来源:不详

答案

C
时态题。By the time +过去时,主句谓语用过去完成时态 选C。 句意:到爱迪生十二岁时他已开始自己谋生了。

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