【用戶】陳婉翎
【年級】國一上
【評論內容】All penguins have very strong beaks, ___________ they also use to defendthemselves against enemies.因為這是關代的限定用法,所以修飾penguins只能用which ,如果沒有那個逗號,是可以用that。至於who,只用來修飾人。資料來源: http://tw.knowledge.yahoo.com/question/question?qid=1511050200511