Since the 1970s, computers ________ at a low enough cost ...

[ 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

Select your answer:

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Time Conjunctions Future Passive Infinitive and Gerund Present Tenses and Vocabulary Was and Were Word Formation Grammar - may & might City Places Auxiliary Verbs (be, do, have)

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