四个人回答没有一个语法完全正确的,我来给你一个没有语法错误的吧
surgery 或 operation 都是可数名词,因此要说a surgery/an operation
Grandma hopes her operation (surgery) is successful.
Grandma hopes to have a successful operation (surgery).
Grandma hopes that her operation (surgery) will be a successful one.
几种用法都可以