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12．宋先生加入排球俱樂部已經三年了．
Mr．Songhas been in the volleyball club for three years．

分析 has been in the volleyball club

解答答案：has been in volleyball club 此題空格部分意思為"已經加入排球俱樂部"，用volleyball club表示"排球俱樂部"；由for three years可知要用現在完成時，主語是第三人稱單數，所以助動詞要用has，加上動詞的過去分詞即可；此題中用延續(xù)性動詞be來表示"加入"用于完成時，它的過去分詞是been，再加上the volleyball club即可．故填：

點評考查對時態(tài)和人稱的掌握；for+時間段是完成時的標志．

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