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

 

C

【解析】

試題分析：考查時態(tài)。By…到…為止；與完成時連用。后面接the time he was twelve是過去時，故主句中使用過去完成時。句意：到他12歲的時候，Edison已經(jīng)開始靠自己謀生了。故C正確。

考點：考查時態(tài)

 

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