They … let you on the plane unless you have ...

[ 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:

Random Topics:
Mix-Tenses Formal & Informal Words Basic Tenses Grammar - Compound Sentences Perfect Verb Tenses If Conditional Zero and One Unless If First Conditional Passive Modals Grammar: so and such

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