单项选择题


A．while
B．before
C．because
D．untill
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单项选择题
A．ThereforeB．HoweverC．OtherwiseD．Although
A．Therefore
B．However
C．Otherwise
D．Although
单项选择题
A．deduceB．determineC．proveD．investigate
A．deduce
B．determine
C．prove
D．investigate
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