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

If she _______________ how to calibrate the instrument, she __________

1.	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
Answer» D. should have known, would have

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

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