-----Do you know the boy _ is sitting next to peter.---Do you know the boy _ is sitting next to peter.---Yes.He is Peter's friend.They are celebrating his ___ birthday.A.who；ninth B.that；ninethC./；nineth D.which；ninth

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-----Doyouknowtheboy___issittingnexttopeter.---Doyouknowtheboy___issittingnexttopeter.---Yes.HeisPet

-----Do you know the boy ___ is sitting next to peter.---Do you know the boy ___ is sitting next to peter.---Yes.He is Peter's friend.They are celebrating his ___ birthday.A.who；ninth B.that；ninethC./；nineth D.which；ninth
-----Do you know the boy ___ is sitting next to peter.
---Do you know the boy ___ is sitting next to peter.
---Yes.He is Peter's friend.They are celebrating his ___ birthday.
A.who；ninth B.that；nineth
C./；nineth D.which；ninth

-----Do you know the boy ___ is sitting next to peter.---Do you know the boy ___ is sitting next to peter.---Yes.He is Peter's friend.They are celebrating his ___ birthday.A.who；ninth B.that；ninethC./；nineth D.which；ninth
答案：A
who引导定语从句,修饰boy.九岁的生日,用序数词,所以正确答案是A.

你认识那个坐在彼特旁边的男孩吗？
认识。他是彼特的朋友。他们正在庆祝他的9岁生日。
选填A
who引导定语从句，修饰boy。ninth是序数词第九个
肯定正确，是最佳答案。请采纳！

选A
the boy是先行词，是人所以应用who。
他第九个生日，他九岁生日。应用序数词ninth

答案：A
解释：who引导定语从句，修饰boy。九岁的生日，用序数词，所以正确答案是A。
祝你学习进步，更上一层楼！请记得采纳，谢谢！(*^__^*)

Do you know the way? do you know the mean do you know the time lunchDo you know the time_____lunch? Do you know the to the question? Do you know the girl i__red? Do you know the girl ___ red what do you know about the Do you know the girl over Do you know the girl for yellow? Do you know the pizza girl? Do you know () the rain come from? Do you know the girl（） glasses The game came over do you know Do you know the boy ()(name) David Do you know what c___ the fire Do you know the question n___ three? do you know the man__________peter smith(name) Do you know what the answer is?