[ Active and Passive Voice ]
Computers ________ since 1940s.
A. is in used
B. was used to
C. used
D. have been in use

Random Topics:
Grammar - Capitalization and Possessive NounsVerb to beConditionals and WishesAdverb Of PlaceVerb Forms and PrepositionsRelative Pronoun/AdverbsSynonymsSimple TenseArticles and DemonstrativesCoherent Sentence with Correct Grammar StructureOther quiz:
Countable & Uncountable Nouns › ViewDo you think we have ___ pain to do all the rooms upstairs?
A. any
B. very little
C. enough
Grammar › View
Conjunctions
A. Hot dog plus hamburger
B. Hot dog is good but hamburger is better
C. Hot dog is good not only hamburger
Modal Verbs › ViewYou ______ turn right when the light is red.
A. don’t have to
B. must
C. mustn’t
D. have to
Present Perfect Tense › View
How long _______ (you/know) ______ each other?
A. did … know
B. have … known
C. do … know
