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GATE 2014 CS (CS3) – Question 2

General Aptitude · Verbal Aptitude: Grammar and Vocabulary · 1 mark · Multiple choice

If she ______ how to calibrate the instrument, she ______ done the experiment.

  1. knows, will have
  2. knew, had
  3. had known, could have
  4. should have known, would have

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Show answer and explanation

Correct answer: (C) had known, could have

Explanation

A past unreal condition uses if she had known, followed by she could have done. This expresses an experiment that was possible under a condition that was not met. Therefore **C**, had known,could have, fits both blanks.