单项选择题

A．Before the Civil War.
B．After the Civil War.
C．During the Civil War.
D．Thirty years ago.
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单项选择题
A．He is applying for a job at a summer camp.B．His telephone is out of order.C．He is writing a character reference for Ben.D．He is replying to Ben’s letter.
A．He is applying for a job at a summer camp.
B．His telephone is out of order.
C．He is writing a character reference for Ben.
D．He is replying to Ben’s letter.
填空题
Accidental discoveries seem to have made by chance but there has to be an observant person present who ______.
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