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把下列句子由单数变为复数或由复数变为单数.1、Thisisabook.2、Thatisabox.3、Arethoserulers?4、Whatarethese.5、Theyaretoys
题目内容：
把下列句子由单数变为复数或由复数变为单数.1、This is a book.2、That is a box.
3、Are those rulers?4、What are these.5、They are toys优质解答
These are books.
Those are boxes.
Is that a ruler ?
What's this ?
It's a toy.
3、Are those rulers?4、What are these.5、They are toys
优质解答
These are books.
Those are boxes.
Is that a ruler ?
What's this ?
It's a toy.
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