whose pens are these?____(these/they) are minewhose pens are these?____(these/they) are mine these和they 两者皆可吗?抑或只能用they?若只能用they为什么?

问题描述:

whose pens are these?____(these/they) are mine
whose pens are these?____(these/they) are mine
these和they 两者皆可吗?抑或只能用they?若只能用they为什么?