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Complete the drummer's interview about their chaotic tour. Choose ALL the options that grammatically fit into the blank to form a correct past perfect continuous sentence.
"By the time the lead singer finally arrived at the venue, the rest of the band ________."
The correct answers are had been practicing for three hours and had been waiting impatiently backstage.
The past perfect continuous is formed with had + been + verb-ing. It emphasizes how long an action was happening before another past event (the singer arriving).
"Has been sleeping" is present perfect continuous. "Were been tuning" is grammatically incorrect (it mixes past continuous and perfect forms).