Select the correct past participle for each blank. For many decades, tungsten filaments have been ____ by makers of contemporary light bulbs, with life spans of 750 to 4,000 hours.
A) use
B) used

Question

Quizplus · Accepted Answer

The sentence is in the present perfect tense, indicating ongoing action up to the present. Therefore, the past participle form is needed, and "used" is the correct past participle form of "use."

Select the Correct Past Participle for Each Blank