【題目】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】C

【解析】by the time意為“到……時(shí)”，引導(dǎo)的從句謂語用一般過去時(shí)時(shí)，主句用過去完成時(shí)表示已完成的動作。

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