[ Past Modals ]
They _______ have heard the announcement, but they didn’t react.
A. could
B. could have
C. must
D. should
Select your answer:

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Verb Tenses and AgreementConjunctions and TransitionsGrammar: Adjectives & PrepositionsTenses, Tag Questions, Phrasal VerbsPast Perfect vs Past SimpleDependent PrepositionVerbs: Will & Going toFuture Tense VocabularyTransitional Phrases and ConjunctionsAdverb PhrasesOther quiz:
Grammar › Viewan over exaggeration that is not to be taken literally
A. hyperbole
B. idiom
C. hazard
D. alliteration
Article › View
Differentiate between ‘a’ and ‘an’ in the sentence: ‘I need ___ apple for the recipe.’
A. a
B. the
C. some
D. an
