作业帮We couldn't find the letter yesterday because he _ (hide)it in the wardrobe.
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We couldn't find the letter yesterday because he _ (hide)it in the wardrobe.
We couldn't find the letter yesterday because he _ (hide)it in the wardrobe.
We couldn't find the letter yesterday because he _ (hide)it in the wardrobe.
这里用过去式hid就行了.
had hid过去完成时表示该动作先发于couldn't find 这个动作