had been circling
Past perfect progressiveconjugation ofcircle.There are other translations for this conjugation.

circle

NASA claims that missions with Gemini atmosphere ships had been circling around the earth.
La NASA afirma que la nave atmosférica Gemini durante las misiones de Gemini habría circulado al rededor de la Tierra.
Matt had not seen him before as Jeremy had been circling the block while trying to persuade his son to sleep.
Matt no lo había visto antes ya que Jeremy daba vueltas a la manzana mientras intentaba que su hijo se durmiera.
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