问题标题：
定语从句)12.Mr.Herpinisoneoftheforeignexpertswho___inChina.A.worksB.isworkingC.areworkingD.hasbeenworking()13.Tomistheonlyoneofthestudentswho___toShanghai.A.havegoneB.havebeenC.hasbeenD.hadgone()14I,___yourg
问题描述：
定语从句
)12.Mr.Herpinisoneoftheforeignexpertswho___inChina.
A.worksB.isworkingC.areworkingD.hasbeenworking
()13.Tomistheonlyoneofthestudentswho___toShanghai.
A.havegoneB.havebeenC.hasbeenD.hadgone
()14I,___yourgoodfriend,willtrymybesttohelpyouout.
A.whoisB.whoamC.thatisD.whicham
李建欣回答：
答案分别是：12C.areworking13.hasbeen14.Bwhoam这都是定语从句.12,who代表先行词experts,所以其谓语动词用复数C.areworking
13.who代表先行词theonlyone,所以其谓语动词用单数C.hasbeen
14.who代表先行词I,所以其谓语动词用am
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