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4．I used to go to the gym three times a week，but I don't        any more．（　�。�
A．work onB．work atC．work outD．work for

分析 我曾經每星期去健身房三次，但是現在再也不健身了．

解答 答案是C．考查動詞詞組的辨析．work on 從事于…，對…起作用；work at 從事于，致力于；work out 鍛煉，解決；work for 為…工作．句意是：我曾經每星期去健身房三次，但是現在再也不健身了．故選C．

點評 解答此類問題首先需要理解每個詞組的含義，然后結合語境選擇正確答案．

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