问题描述：
下面句子中的特殊疑问词用法错误,请改正 who's books are these?Are they yours?
who's books are these?Are they yours?
what boy is the tallest in you class?
Which could come to help me?
who's books are these?Are they yours?
what boy is the tallest in you class?
Which could come to help me?
问题解答：
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