The engineers _________ (invent) a new system for transporting water ...

[ Narrative Tenses ]

The engineers _________ (invent) a new system for transporting water last year.

A. invented

B. was inventing

C. had invent

Select your answer:
A B C D E

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Subordinating Conjunction Vocabullary Test Suffixes (ing-ed) Sentences Modals for Obligation Auxiliary Words Pronouns, Verb, Conjunction Gerund Idioms Poetry Was & Were Questions

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