was sealing
Past progressive conjugation of seal. There are other translations for this conjugation.

seal

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500+ learners.
My only hesitation about this method was sealing the bag with a metal staple.
Mi única duda acerca de este método era el tener que sellar la bolsa con una grapa metálica.
I'm so glad you had the sense not to break out while I was sealing you up.
Me alegro de que tuviese la sensatez de no escapar mientras lo encerraba.
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