is 是呼应之后的 improvement ;
improvement 在此作[U]不可数名词; 表示"进步,改善"之意
不可数名词 应使用单数哦.
some 也可作 "某一,某种"来解释; 并不全针对复数使用的.
这句句子为什么用is some Unless there is some improvement,more and mo
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