They … let you on the plane unless you have ... | GrammarQuiz.Net

[ Conditionals / Unreal Past ]

They … let you on the plane unless you have a valid passport.

A. had

B. have

C. will

D. won`t

Select your answer:

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Verbs, Tenses, and Vocabulary Adverbs of Degree Verb-ing and Infinitive Types of Sentence Structures Verbs and Tenses Verb & Grammar Helpful Phrases Present Progressive or Present Simple Simple Future Tense Present Perfect Simple & Present Perfect Continuous

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A. Go

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A. have done
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