By the time he was twelve, Edison ________ to make a living by himself .A．would - 高中英语试题 - 超级试练试题库

题目

题型：不详难度：来源：

By the time he was twelve, Edison ________ to make a living by himself .

A．would begin

B．has begun

C．had begun

D．was begun

答案

解析

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。

核心考点

试题【By the time he was twelve, Edison ________ to make a living by himself .A．would 】；主要考察你对一般现在时等知识点的理解。[详细]

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