The transistor ______ in 1948. As a result of this, both the size and the cost of electronic equipment______ greatly reduced. A) was invented / have been B) had been invented / has been C) was invented / have had D) had invented / will be

The transistor ______ in 1948. As a result of this, both the size and

1.	The transistor ______ in 1948. As a result of this, both the size and the cost of electronic equipment______ greatly reduced. A) was invented / have been B) had been invented / has been C) was invented / have had D) had invented / will be
Answer» Correct option is A) was invented / have been

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The transistor in 1948. As a result of this, both the size and the cost of electronic equipment greatly reduced. A) was invented / have been B) had been invented / has been C) was invented / have had D) had invented / will be

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