单项选择题


A．alters
B．varies
C．shifts
D．changes
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单项选择题
A．involvedB．participatedC．attendedD．employed
A．involved
B．participated
C．attended
D．employed
单项选择题
A．trainingB．promotionC．nutritionD．cultivation
A．training
B．promotion
C．nutrition
D．cultivation
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