NeitherEnglishnorChinese________difficulttolearn.
C
neither …nor…是固定搭配， 意思是：既不……也不……。 它需要遵循就近原则， 谓语动词应与 Chinese 一致，所以答案是 C。
Scientistsdoubtwhetherit’s________toregulateone’sbiologicalclockbydrinking.
Thegirlwasluckyenoughto_______thebadmenandranaway.
TheWesternCouncilforTravelResearchin_______employedthetermvisitor.