单项选择题

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

A．would begin
B．had begun
C．has begun
D．was begun
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If I ______ out of my ink, I would have finished writing the composition.
A．didn't run
B．shouldn't have run
C．haven't run
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Rarely ______ by so many students.
A．so much time has been wasted
B．has so much time wasted
C．has so much time been wasted
D．has wasted so much time
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