英语翻译medical research are painfully aware that there are many
英语翻译
medical research are painfully aware that there are many problems___
(他们至今还没有答案)
正确答案是which they still have no answers today.但我可以不可以写成 to have no keys today,这样写算错吗?
"to"后面的成分不是所谓的不定式做problems的定语吗?不就相当于定语从句了.