John is not____ whether Eddie likes the picture of him and his f

John is not____ whether Eddie likes the picture of him and his family.
A、ensure
B、assure
C、sure
D、surely
【正确答案】：C
【题目解析】：ensure 保证；assure 使确信；sure 确信的；surely 当然；根据句子分析，空格部分为形容词，因此排除AB，句意：约翰不确定埃迪是否喜欢他和他家人的照片。C符合题意