[求助]2004/08語法26

32. Fats and fixed oils are greasy or waxy substance that ill their pure state are normally tasteless, colorless, and odorless.'

請教一下

知道是substance出了問題

但是這裡的ill是怎麼回事??

當形容詞還是動詞??

我怎麼跟後面連不起來了阿

很可能是题目错了

substance 要加s

ill 是動詞

that ill their pure state 為形容詞子句修飾substances