All candidates are strictly advised to refrain _____ conversing with one another during the test.

Answer and explanation

Correct answer: B. from

  1. Step 1: The intransitive verb 'refrain' requires the preposition 'from' followed by a gerund. Step 2. One refrains 'from' engaging in an prohibited activity. Answer: from. Why not the others: 'To', 'against', and 'at' do not idiomatically collocate with 'refrain'.

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