The question starts with incomplete sentences. Beneath each sentence, there are four words/phrases marked a, b, c and d. Choose the one word/phrase that best completes the sentence.

A loudspeaker is an instrument _____ electrical energy into sound energy

Created: 5 months ago | Updated: 5 months ago
Updated: 5 months ago

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He doesn't know swimming.
He doesn't know how to swim.
He doesn't know how to swimming.
He doesn't know to swim.
Created: 1 hour ago | Updated: 1 hour ago
Updated: 1 hour ago
Everybody have gone there.
Everybody are gone there.
Everybody has gone there.
Everybody has went there.
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