[ Modal Verbs ]
The snake disappeared from the zoo some time on Thursday. ‘It ____ slipped out of the cage while the door was open.’
A. had to
B. should have
C. needn’t have to
D. must have
Select your answer:

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Verb Tenses and Past ParticiplesGrammar, Conditional Sentences, VocabularyFuture Tensesgoing toSimple Present Tense with Adverb of FrequencyArticle & PrepositionVerb FormsBasic GrammarPreposition after some VerbsGrammar : Structural Common ErrorsOther quiz:
Comparisons › ViewTom is ………………….. than David.
A. handsome
B. the more handsome
C. more handsome
D. the most handsome
Grammar › View
She seldom _____ to the cinema.
A. go
B. goes
C. watch
D. walk
