What are those?- ______.A.They are apple trees B.Those are apple trees为什么不选B而是选A,这是语法规定还是习惯用法?

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What are those?- ______.A.They are apple trees B.Those are apple trees
为什么不选B而是选A,这是语法规定还是习惯用法?

因为上文已经出现those ,下文中再出现它时 ,就要用人称代词they 来代替它