had been drilling

Past perfect progressive conjugation of drill. There are other translations for this conjugation.

drill

el taladro

taladrar

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NOUN

(tool)-el taladro

Synonyms for drill

el martillo neumático

TRANSITIVE VERB

(to make a hole in)-taladrar

Synonyms for drill

NOUN

(training)-el entrenamiento

Synonyms for drill

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