第29题: [单项选择]I got a new battery for my recorder only last week, but it seems to have ______ already. A. worn out B. run down C. knocked off D. gone off 参考答案:B 答案解析:[解析] 本句是说我上周刚给收音机买了一块新电池,但现在电似乎已经用完了。run down意为“用完”,符合句意。其他三项“wear out穿破,用坏,疲劳;knock off撞倒,敲掉;go off