I got a new battery for my recorder only last week, but it seems to have ______ already.

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问题 I got a new battery for my recorder only last week, but it seems to have ______ already.

选项 A、worn out
B、run down
C、knocked off
D、gone off

答案B

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去世,消失”都不正确。
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