单项选择题

A full ______ of all the reasons for and against closing the railway has begun.

A．explosion
B．exploration
C．exploitation
D．explanation
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单项选择题
Some disputes among these countries are ______ by history.
A．left over
B．turned over
C．handed over
D．taken over
单项选择题
Although students may be in a ______ position, teachers shall treat them as equals.
A．subsidiary
B．submarine
C．subordinate
D．subsequent
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