Those are some keys.(改为单数）

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• 过去分词和现在分词完成被动形式有什么区别在纸上默写你背过的单词时你应该合上字典.这句我写了几个句子不知道哪个对 1.writing your memorized words on the paper from your memory,you would shut up your dicationary.2.writing your words having been memorized on the paper from your memory,you would shut up your dicationary.用when来写 3.when you write your memorized words on the paper from your memory,you would shut up your dicationary.4.when you write your words having been memorized on the paper from your memory,you