单项选择题

A．involve
B．delay
C．retard
D．foster
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单项选择题
A．workedB．stayedC．studiedD．talked
A．worked
B．stayed
C．studied
D．talked
单项选择题
A．exerciseB．programC．studyD．research
A．exercise
B．program
C．study
D．research
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