单项选择题

A．The student can’t leave unless he has put everything back in the cupboard.
B．The student can leave after he turns off the electricity.
C．The student can leave after he has tidied the lab.
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单项选择题
A．At any place.B．At the corner.C．At any place without traffic.
A．At any place.
B．At the corner.
C．At any place without traffic.
单项选择题
A．He is afraid of misunderstanding.B．The man wants to confuse her.C．To show off his skill in drawing maps.
A．He is afraid of misunderstanding.
B．The man wants to confuse her.
C．To show off his skill in drawing maps.
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