I got a new battery for my recorder only last week, but it seems to have______ a

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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块新电池，但现在电似乎已经用完了。rundown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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