My watch has stopped.______(准是电池用完了).

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问题 My watch has stopped.______(准是电池用完了).

选项

答案The battery must have run out.

解析 must have done表示对过去情况的肯定猜测。 run out表示用完,这里注意汉语中的被动表达在英语中为主动语态。又如:Our supplies finally ran out.我们的供给终于耗尽了。与介词of连用,如:They ran out of money and had to abandon the project.他们钱用完了,不得不放弃计划。
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