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

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

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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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