He had undergone operation vs he has undergone operation

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he had undergone operation is the most popular phrase on the web. 

he has undergone operation

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he had undergone operation

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Some examples and use cases from the internet:

Some examples and use cases from the internet:

  • have not undergone operations there other than unloading and reloading.
  • Our colleague, Mr Brok, has undergone an operation.
  • As some Members already know, the President of the European Parliament has undergone a minor operation for appendicitis.
  • People who have worked in hospitals have said that as many as 6000 Falun Gong members have undergone operations to have internal organs removed, and that at least three quarters of them have died as a result of the operation.
  • (iii) have not undergone operations there other than unloading and reloading or any other operation to keep them in good condition.
  • 5. 'prepared products' means any fishery product which has undergone an operation affecting its anatomical wholeness, such as gutting, heading, slicing, filleting, chopping, etc.;
  • Any refund on products which have undergone operations as referred to above shall be determined on the basis of the quantity, type, and characteristics of the products at the date used to calculate the refund, in accordance with Article 27.
  • have undergone a surgical operation or invasive procedure;
  • have not undergone operations there other than unloading and reloading.
  • Any refund on products which have undergone operations as referred to above shall be determined on the basis of the quantity, type, and characteristics of the products at the date used to calculate the refund, in accordance with Article 27.
  • (iii) have not undergone operations there other than unloading and reloading or any other operation to keep them in good condition.
  • How would you feel if you had undergone such an operation?
  • have undergone a surgical operation or invasive procedure;
  • Our colleague, Mr Brok, has undergone an operation.
  • People who have worked in hospitals have said that as many as 6000 Falun Gong members have undergone operations to have internal organs removed, and that at least three quarters of them have died as a result of the operation.
  • Anteo had undergone an operation on his tongue to reshape the spaces of his mouth to approximately coincide with the proportions of the singing apparatus of the starling.

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