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.

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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.

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.
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.

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.
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.

had bought
这里应是过去完成时，因为后面的didn't说明是过去时，是一个在此之前的行为影响了the pen didn't work

填bought或者had bought。因为后面的补语时态已经是过去时，所以买这个动作必然也是过去的，如果要强调更早，就用had bought，不强调的话用bought就行。

had bought 这里应是过去完成时，因为后面的didn't说明是过去时，所以是过去完成时

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