When do we use the past perfect continuous tense?

Anglès - Gestió de vendes i espais comercials

a: To describe an action after a specific moment in the past
b: To emphasize the completion of an action
c: To express an action that started before another past action
d: To describe a future event

Resposta correcta: c

Explicació: The past perfect continuous expresses an action that occurred before a specified moment in the past, emphasizing its duration.

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