单项选择题


A．Therefore
B．However
C．Otherwise
D．Although
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单项选择题
A．whileB．beforeC．becauseD．untill
A．while
B．before
C．because
D．untill
单项选择题
A．indicatedB．discoveredC．illustratedD．estimated
A．indicated
B．discovered
C．illustrated
D．estimated
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