单项选择题

Robert Spring spent 15 years ______.

A．running a bookstore in Philadelphia
B．writing letters to Miss Fanny Jackson
C．selling false signatures
D．selling autographs
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单项选择题
A．becameB．becomingC．becomeD．to become
A．became
B．becoming
C．become
D．to become
单项选择题
A．normalB．commonC．ordinaryD．extraordinary
A．normal
B．common
C．ordinary
D．extraordinary
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