单项选择题

A．to
B．since when
C．as when
D．to when
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单项选择题
A．coincidedB．coincidingC．togetherD．contrary
A．coincided
B．coinciding
C．together
D．contrary
单项选择题
A．releasedB．was releasedC．has been releasedD．had been released
A．released
B．was released
C．has been released
D．had been released
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