题目内容

-Do you know the boy________ is sitting next to Peter?
-Yes. He is Peter's friend. They are celebrating his ________ birthday.
A.who; ninthB.that; ninethC./; ninethD.which; ninth
A
who 引导定语从句,在从句中作主语,其他的词为表示人的名词或代词,表示第几个生日要用序数词。
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