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thisthatpenknifewatchboypianobaseballpotatoapple这几个单词的复试形式是什么

题目详情
this that pen knife watch boy piano baseball potato apple这几个单词的复试形式是什么
▼优质解答
答案和解析
these
those
pens
knives
watches
boyes
pianos
baseballs
potatoes
apples