Having worked as a doctor for so many years, Mr. White has （） rich experience in battling with vario...

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has worked　 worked had worked　 works

To be worked To work Having worked Having been worked

not having worked having not worked to have not worked not to work

Having been worked Not to have worked Having never worked Never have worked

having worked have been worked Have worked worked

new technique_________, the yields as a whole increased by 20 percent. A.working out having worked out having been worked out to have been worked out

worked has worked works had worked

Having been worked Working Worked Having worked

working out having worked out having been worked out to have been worked out

not to work having not worked to have not worked not having worked

Working Having worked To worked Being worked

not to work having not worked to have not worked not having worked

working out having worked out to have been worked out having been worked out

worked has worked was working will work

not to work having not worked 　 to have not worked not having worked

working out having worked out having been worked out to have been worked out

accumulated reserved increased developed

has worked worked had worked works

not to work having not worked 　　 to have not worked not having worked