By the time he was thirteen, Thomas ______ to make a living by himself.A、would b

游客2024-06-28  2

问题 By the time he was thirteen, Thomas ______ to make a living by himself.

选项 A、would begin
B、had begun
C、has begun
D、was begun

答案 B

解析 “到过去某时之前”用过去完成时。
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