[ Grammar ]
They _____ at this conference for the last two days.
A. have been
B. were
C. are
D. be

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Simple Past Tense and Past Perfect TenseModal VerbSpeculation with Modal VerbsAuxiliary Verbs, if, unless and ModalAdverbial ClauseComparatives - SuperlativesSentence Adverbs & Third ConditionalPresent PerfectFigure of SpeechModals - Reported Speech - ConditionalsOther quiz:
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