单项选择题


A．after
B．on
C．with
D．to
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单项选择题
A．altersB．variesC．shiftsD．changes
A．alters
B．varies
C．shifts
D．changes
单项选择题
A．involvedB．participatedC．attendedD．employed
A．involved
B．participated
C．attended
D．employed
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