单项选择题


A．isn't
B．weren't
C．aren't
D．wasn't
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单项选择题
A．outputsB．filesC．flashesD．detains
A．outputs
B．files
C．flashes
D．detains
单项选择题
A．proposedB．witnessedC．canceledD．figured
A．proposed
B．witnessed
C．canceled
D．figured
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