-----book on the desk is ----useful one答案是：The book on the desk is useful one.为什么useful前面不能用an或the?
问题描述：
-----book on the desk is ----useful one
答案是：The book on the desk is useful one.为什么useful前面不能用an或the?
答
is强调的是“是”
是一本有用的书
an和the是什么意思呢
LZ?