From the words or group of words lettered A to D, choose the word or group of words that best completes each of the following sentences.
Before the lecturer entered the hall, we .......... the board.
The correct answer is 'had cleaned'. This is an example of the past perfect tense, which is used to show that an action was completed (or 'perfected') at some point in the past before something else happened. In this case, the action of cleaning the board was completed before the lecturer entered the hall.
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