Not only the students but also the old teacher ______ been chang

Not only the students but also the old teacher ______ been changed.
A、was
B、were
C、has
D、have
【正确答案】：C
【题目解析】：not only…but also…是固定搭配，意思是：不但……而且……。它需要遵循就近原则，谓语动词应与the old teacher一致，所以答案是C。