He spoke so ___ that nobody at the back could hear him.

Answer and explanation

Correct answer: D. quietly

  1. Step 1: Read the sentence and decide what kind of word or phrase the gap needs. Step 2. An adverb is needed to modify the verb 'spoke'. Answer: quietly. Why not the others: 'Quiet' is an adjective, 'quietness' a noun and 'quieten' a verb.

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