单项选择题


A．addition
B．practice
C．dictation
D．demonstration
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单项选择题
A．relatedB．joinedC．assembledD．linked
A．related
B．joined
C．assembled
D．linked
单项选择题
A．involvedB．interestedC．participatedD．joined
A．involved
B．interested
C．participated
D．joined
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