[ Passive Voice ]
Someone must ____ the door. They are waiting there.
A. be opened
B. open
C. opened
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Articles & PrepositionDegree of ComparisonSynonymsArticles and NounsConnectivesVocabulary : Coming & GoingPresent Perfect or Past SimpleAsking and Giving OpinionGrammar, adverbs of frequency placementGerunds in SentencesOther quiz:
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A faucet from which water flows
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