After all the workers __________ (go) home, the security guard ...

★ Past Perfect and Past Perfect Continuous Tense

After all the workers __________ (go) home, the security guard locked the office.

A. go

B. had gone

C. went

D. are going

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Which tense is this?

“At last the bus came. I had been waiting for haft an hour!”

A. Simple Past

B. Past Continuous

C. Past Perfect

D. Past Perfect Continuous