问题描述：
( )Tim _____ the school basketball team for three weeks.( )Tim _____ the school basketball team.
( )tim _____the school basketball team activities.
a.has jioned b.has jioned in c.has been d.has beenon
( )tim _____the school basketball team activities.
a.has jioned b.has jioned in c.has been d.has beenon
问题解答：
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