Jack joined the volunteer team in 2010.
A.Jack has worked in the volunteer team since 2010.
B.It was in 2010 that Jack began doing volunteer work.
C.Jack began doing volunteer work in 2010.
D.Jack started the volunteer team in 2010.
A.Jack has worked in the volunteer team since 2010.
B.It was in 2010 that Jack began doing volunteer work.
C.Jack began doing volunteer work in 2010.
D.Jack started the volunteer team in 2010.
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