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Complete the sentence: The new drug must undergo rigorous trials ____ it can be approved for public use.

Correct answer: A. before

  • A. before
  • B. after
  • C. unless
  • D. although

Explanation

Trials logically precede approval, so before is the only connector that puts the two events in the right order. After reverses the sequence and unless would make approval the default. Time relationships are as much a part of these questions as meaning.

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Sentence completion tests whether you can use grammar, vocabulary, logic and context together to supply the missing word or phrase. The correct choice must fit the sentence's meaning, tone, tense, structure and connective relationship, not merely match one isolated grammatical clue.

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