单项选择题

A．for some reason
B．for some time
C．for example
D．for this means
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单项选择题
A．continuityB．vacuumC．.truthD．vacancy
A．continuity
B．vacuum
C．.truth
D．vacancy
单项选择题
A．itsB．theirC．their ownD．the
A．its
B．their
C．their own
D．the
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