[ Tenses ]
There ____ economies since the beginning of civilization, but as a field of study, economics ____ only recently.
A. have been / develops
B. are / has been developing
C. have been / has developed
D. were / was developing
Random Topics:
How often - long - much - manyAsking & Giving AttentionGrammar RulesGoing To Be and WillPerfect Verb TensesModalPersonificationActive & PassivePositive and Negative ConnotationsVerb Patterns / IngOther quiz:
Grammar › View______ name is Omar.
A. My brother’s
B. My brothers’
Grammar › View
He said we _____ enough food to last a week.
A. were taken
B. were to take
C. were to have taken
D. were to have take
Grammar › ViewListen! The baby ______ over there.
A. is crying
B. are crying
C. to cry
D. crying
Preposition of Time › View
After I eat dinner, I like to watch TV _____ the evening.
A. in
B. on
C. at