Topics: 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:
Present Simple with Adverbs of FrequencyFew, a few, little, a littleDescribing WordsPresent ContinuousPassive with ModalsSuperlative & Comparative AdverbsPreference & Future TenseSubjective and Objective PronounNouns as AdjectivesConditionals / Unreal PastOther quiz:
Grammar › ViewWas the vet surprised? No, he had _____ snakes before.
A. treated
B. looked
C. tried
Comparative › View
If you want to stay slim, you have to eat ………..
A. more generously
B. more traditionally
C. more slowly
D. more healthily
