1.have learnt2.learned3.learned4.had5.had6.had have7.Have been8.be9.had finished10.finished11.began12.had been13.studied14.cleaning15.was doing（多花了一个横线吧...）不知道是不是全对...参考一下吧...
英语高手进1.We _____ {learn} about 3000 English words since we ca
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英语作文 a word about english learning
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英语翻译They’ve learned a lot about us since then.And so have we