关于这场战争的起因，历史学家们已经写了很多。
Much has been written about the causes of the war.
▼点击显示答案
much英 /mʌtʃ/|美 /mʌtʃ/
解释
much 作为主语代词，指「大量的内容/研究/论述」，后接被动语态 has been written
Much has been written about the causes of the war.
much 作为主语代词，指「大量的内容/研究/论述」，后接被动语态 has been written