单项选择题

A．was taking
B．had taken
C．would take
D．would have taken
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单项选择题
A．whenB．beforeC．untilD．since
A．when
B．before
C．until
D．since
单项选择题
A．evidenceB．evaluationC．examplesD．estimates
A．evidence
B．evaluation
C．examples
D．estimates
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