[ Tenses ]
Which one is the correct answer?
A. Did your friend explore the country in his twenties?
B. Had your friend been exploring the country in his twenties?
C. Had he exploring the country in his twenties?
D. Did your friend explored the country in his twenties?

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Can vs be able toModals and Comparative SuperlativeVerbs and AdverbsWord FormationGerunds and TensesComparative - SuperlativeSimple Verb TensesVerbs of movementAuxiliary VerbsLinking Verbs & Helping VerbsOther quiz:
Passive Voice › ViewMany accidents … by dangerous driving.
A. is caused
B. is being caused
C. are caused
D. caused
Grammar › View
The ____ were given an order by their superior to maintain peace and order.
A. Policeman
B. Policemen
C. Policemans
D. Policemens