保证准确率!

= They seem not to have known the news.
他们似乎还不知道这个消息.

seem to have done sth 似乎做过某事
而不定式的否定是在to前面加上not


如果对你有所帮助,请点击我回答下面的“选为满意回答”按钮,谢谢!