从句改错,adverb clause1,they sold the piano,because it had sentimental value.2,After redbull became hugely popular,began to produce energy drinks.3,选择个连词 whereas everthough because if链接下面的2个句子（可以换顺序）：exte
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They sold the piano because it had sentimental value.去掉逗号.
Redbull became hugely popular,before producing energy drinks.
直接在第二个句子的结尾用if,然后是第一个句子.
我不是很确定哦,感觉第一个最不确定.