He took an oath of loyalty to the government.

他做了效忠于政府的宣誓。

《柯林斯英汉双解大词典》

He took an oath that he had seen the defendant leaving the scene of the crime.

他发誓说他曾看见被告离开了犯罪现场。

youdao

He took an oath that he had seen the defendant leaving the scene of crime.

他赌咒曾看到过被告从犯罪现场离开。

《新英汉大辞典》

At one point during Clown U, the volunteers raised their right hands and took an oath.

WSJ: On Thanksgiving, She Reigns in This Parade

Each congressman and senator, and even the president, took an oath to uphold and defend the Constitution.

CNN: IRS scandal needs more than a scapegoat

They took an oath to support and defend the Constitution of the United States against all enemies foreign and domestic.

CENTERFORSECURITYPOLICY: Forcing our all-volunteer force to fail