recubrieran
-they/you covered
Imperfect subjunctiveellos/ellas/ustedesconjugation ofrecubrir.

recubrir

El trombo residual pudo ser la causa de esta mala aposición y de que no se recubrieran los struts.
The cause of this malapposition and of the struts not being covered could have been the residual thrombus.
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to purr