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16．My brother has _____the army since 2years ago．（　�。�

A．

joined

B．

been in

C．

taken par in

分析我的哥哥兩年前就參軍了．

解答答案：B．
結合since 2years ago可知動作發(fā)生在過去，持續(xù)了一段時間，故用現(xiàn)在完成時have/has+過去分詞，加入join是短暫性動詞，不能與一段時間連用，故換成be in，be的過去分詞been，故答案是B．

點評現(xiàn)在完成時的未完成用法只適用于延續(xù)性動詞，不可用于終止性動詞，即瞬間完成或延續(xù)時間很短的動詞．如：come，go，arrive，leave，join，become，die等．

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