At the age of 20．,By the age of 12．,When he was at high-找考题网

单项选择题

A．At the age of 20.
B．By the age of 12.
C．When he was at high school.
D．When he studied in Harvard University.

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问答题

A．Giving a different prescription.B．Seeing how he is doing.C．Waiting another day or two.D．Finding some new ways.

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