How beautiful the sweaters are!
What a beautifu sweaters!是复数啊sorry!What beautifu sweaters!应该有BE动词吧What beautifu sweaters they are.不好意思，刚才在看新闻.补充一点.How beautiful the sweaters are!中the sweaters 是主语，所以前面加定冠词the.What beautiful sweaters they are.中the sweaters 是宾语，所以前面不要the，因为前面已有定语beautifu.What beautiful sweaters!是口语化的，也可以但这里因你的原句并非简写，所以应该采用完整句.What beautiful sweaters they are.希望能帮到你，不明请hi我