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

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GATE : General Aptitude

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

A. knows, will have

B. knew, had

C. had known, could have

D. should have known, would have

Solution

C. had known, could have

Explanation

If she had known how to calibrate the instrument, she could have done the experiment.