单项选择题

A．cycles
B．courses
C．tasks
D．basics
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单项选择题
A．involveB．delayC．retardD．foster
A．involve
B．delay
C．retard
D．foster
单项选择题
A．workedB．stayedC．studiedD．talked
A．worked
B．stayed
C．studied
D．talked
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