问题描述：
they are setting the table for their friends 对划线部分提问 their firends 是划线的
they are setting the table for their friends 对划线部分提问 their firends 是划线的
—— —— （两个空） are they setting the table?
they are setting the table for their friends 对划线部分提问 their firends 是划线的
—— —— （两个空） are they setting the table?
问题解答：
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