We're having a party tonight: my mum and sister have cooked/been cooking all day long

We're having a party tonight: my mum and sister have been cooking all day long

Объяснение:

Present Perfect Continuous используется для подчеркивания длительности действия, которое началось в и продолжается до сих пор.

We're having a party tonight: my mum and sister have been cooking all day long