The operation John had was not successful.为什么用had呢,整句意思不是John的手术没有成功吗,为什么用had呢,我知道是定语从句，可是为什么还有was

The operation John had was not successful.请问The operation John had是倒装吗 the requested clipboard operation the sameness in operation the operation has timed The operation has After the operation什么意思 The operation has timed-out. The operation John had was not successful.为什么用had呢,整句意思不是John的手术没有成功吗,为什么用had呢,我知道是定语从句，可是为什么还有was The doctor p_______ the operation successfully. The doctor performed the operation with succes. 英语翻译Could not complete the requested operation operation times to the seconds怎么翻译 what is the opposite operation of multiplication? do you want to retry the operation the operation was completed successfully是什么意思 where's the john? How does the ERP affect the operation of the business john is a h———— student he's one of the best students in our class