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Nobody believed a 92-year-old man could run a marathon_______he passed the finishing line.People of all ages can challenge themselves.
Nobody believed a 92-year-old man could run a marathon_______he passed the finishing line. People of all ages can challenge themselves.

A.
if
B.
since
C.
until
D.
unless
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参考答案:
参考解析:
.
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