Past Perfect Continuous Tense How long _______ before they ...

[ Tenses ]

Past Perfect Continuous Tense

How long _______ before they finally finished the project?

A. did they work on it

B. had they been working on it

C. have they been working on it

D. were they working on it

Select your answer:

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Simple, Compound, Complex Sentences Adjectives (-ed / -ing)Vocabulary and Definitions Relative Clauses and Past Perfect Past Participle Grammar, Literature, and Vocabulary Transitions Linkers and Conjunctions Question Tag

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