Do you know the boy is sitting next to Jim?
Yes. He is Jim’s friend. They are celebrating his birthday.
A. who, ninth
B. that, nineth
C. /, nine
D. which, nine
网友回答
(答案→)A. who, ninth
B. that, nineth
C. /, nine
D. which, nine
解析：此题重点考查定语从句的引导词和序数词的用法。先行词The boy 在从句中充当主语，引导词可以用who也可用that。某人的第几生日要用序数词。