单项选择题


A．leaves
B．is left
C．left
D．has left
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单项选择题
A．is not allowedB．is allowedC．were not allowedD．were allowed
A．is not allowed
B．is allowed
C．were not allowed
D．were allowed
单项选择题
A．incidentsB．happeningsC．troubleD．accidents
A．incidents
B．happenings
C．trouble
D．accidents
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