Hospital staff burst into cheers after doctors completed a 20-hour operation to have separated one-year-old twins at the head.疑问：to have....在句中作定语还是状语，是什么状语?
...pean scientists had been flabbergasted at how much progress China appeared to be making in this area.早在二十年前，前来访问的欧洲科学家们就因看到中国在这一领域所取得的巨大进步而倍感惊讶。请问：appeared to be making，在句中怎么解释，作什么成...
我的理解是it指代的skill，后半句可以变成：skill knows when to guess or
what questions to skip.为了表达状态的转换，改成了is knowing，比如 She is being smart.意思是她可能平时不聪明，但现在突然聪明了一下。这里when表示什么时候怎么怎么样...
... the most effective way of
solving the problem of overflowing landfills is to encourage people to take responsibility for reducing the
wast they produce themselves.请问句中的
take responsibility for reducing 可以换成
take responsibility to reduce 吗?
It is a year when our children begin learning to develop an entirely new relationship with the world as they head down the road to independence.请老师讲一下as they head down the road to independence是什么成分和结构？谢谢老师。
我看牛津词典上way作为方式方法途径，为 way to do sth 或者 way of doing sth，但是柯林斯词典上却有 The towns are on the way to becoming agglomerations of desperately poor people.请问这个句子是有错误么？