单项选择题


A．about
B．at
C．in
D．with
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单项选择题
A．permitB．letC．allowD．agree
A．permit
B．let
C．allow
D．agree
单项选择题
A．is performedB．performedC．be performedD．perform
A．is performed
B．performed
C．be performed
D．perform
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