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关于一道英语填词的.请教并说明为什么.谢谢
The pen you ______(buy) didn't work.
人气:243 ℃ 时间:2020-06-19 08:29:14
解答
had bought
主句主语The pen
谓语didn't work
因此you ______(buy) 作为从句时态是过去的过去,所以是过去完成时.
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