[ Tenses ]
He ___ his keys while he was closing the office and locking the door.
A. forgot
B. forgets
C. forgetting
D. has forgotten

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To infinitive - GerundMesopotamia VocabularyTransition WordsDependent PrepositionMuch, many, a lot of, a few, a littleExclamationPhrase or ClausePresent Simple or Present ContinuousMixed TensesPast Perfect TensesOther quiz:
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A. knowledge
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A. a
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