Exams › GATE › General Aptitude
If she ____________ how to calibrate the instrument, she ____________ done the experiment.
- knows, will have
- knew, had
- had known, could have
- should have known, would have
Correct answer: should have known, would have
Solution
The sentence expresses an unreal condition in the past. The correct structure is 'If she should have known..., she would have done...'. Among the options, this is the only one that fits the intended conditional meaning best.
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