[ Vocabulary and Grammar ]
. ‘How long _____ on this before you came up with the perfect design?’ ‘Oh, for about ten years.’
A. had you been working
B. you had worked
C. you had been working
D. would you work

Random Topics:
Articles and PronounsPassive Voice of TensesComparatives, Superlatives, and ModalsPresent Perfect & Past Simple TenseCoordinate ConjunctionHelpful Phrases On, At, ByTenses, Tag Questions, Phrasal VerbsComparatives and Past Perfect TensePreference & Future TenseOther quiz:
Question Tags › ViewYour mother is a doctor, …?
A. she is
B. isn’t it
C. doesn’t she
D. isn’t she
Grammar › View
Choose the modal auxiliary that would show obligation and best complete the following sentence:
You ________________ always clean your room
so your parents don’t have to do it!
A. Can
B. May
C. Should
D. None of the above