单项选择题

A．As a rule
B．By contrast
C．For instance
D．In addition
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单项选择题
A．engagesB．includesC．containsD．concerns
A．engages
B．includes
C．contains
D．concerns
单项选择题
A．carried onB．carried outC．carried throughD．carried off
A．carried on
B．carried out
C．carried through
D．carried off
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