[ Passive Voice ]
Since the 1970s, computers ________ at a low enough cost to allow individuals to own a personal computer.
A. will be produced
B. have been produced
C. are produced
D. were produced

Random Topics:
Grammar: is/are/was/wereUsed to & would & Past SimpleHas and HaveSimiles, Metaphors, Personification and HyperbolePronouns and Subject Verb AgreementFirst Conditional & Future TensesInfinitives and ING FormsPassive Voice, Modals of Deduction and First Conditionaltake, make, doHow often - long - much - manyOther quiz:
Conjunctions › ViewI wanted to go swimming, ______ the pool was closed.
A. so
B. but
C. because
D. and
Tenses › View
My sister (invite) lots of friends for dinner every week
A. invited
B. invite
C. is inviting
D. invites
E. was inviting
Grammar › ViewShe finished ______ her project at 10pm last night.
A. to do
B. doing
Vocabulary › View
What does “reluctant” mean?
A. Unwilling or hesitant to do something
B. Very eager and excited
C. Completely certain about something
D. Very happy and satisfied