Question

the unit he works in is a university, whose personnel _very highly trained. A have B has C is D ...

the unit he works in is a university, whose personnel _very highly trained. A have B has C is D are 求详解

Answer 1

定语从句的主语是
personnel(whose只是定语，修饰personnel)
personnel
[,pə:sə'nel]
n.
人事部门;全体人员(集合名词)
是一个类似people的名词，视作复数概念，谓语跟着用复数
trained过去分词，表示被动，构成被动用:be
+
done(过去分词)，因此用be
的复数形式，且为现在时(前面主句是is
现在时)
综上，填写D
are