They have worked together ____________ twenty years. A. for ...

[ Present Perfect ]

They have worked together ____________ twenty years.

A. for

B. since

C. never

D. have

Select your answer:

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So, Such, Many, Much Prepositions of Time & Place Continuous and Perfect Tenses Pronouns, Verb, Conjunction Gerunds & Infinitives + Vocabulary Simple and Continuous Present Tense Adverb of Frequency and Past Continuous Tense Simple Verb Tenses Conditional Sentences

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