NO.PZ2018062004000075
问题如下：
Normal operating expenses have been paid in advance are:
选项：
A.unearned revenue
B.accrued expenses
C.prepaid expense
解释：
C is correct. Prepaid expenses are expenses that have been paid in advcance.
liability里面的operating一般不是包含AP跟unearned revenue吗？我记得unearned revenue说是付了钱，服务还没有提供完。这跟paid in advance是一个意思吧，都是预付款？
