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:

Random Topics:
Definite, Indefinite and Zero Articles Conjunction and Punctuation Prepotitions Grammar: was/were Adverb of Time Gerund & Infinitives Grammar - Present Perfect with for and since To infinitive - Gerund Past Participles

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A. at

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What is the synonym for “postpone”?

A. delay

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C. hurry

D. interval