I ___________ made arrangements had I ___________ informed earlier.
GATE Chemistry - 2017,
Answer: A
The blanks take could have, been: 'I could have made arrangements had I been informed earlier.'
This is a third conditional, about an unreal past situation. The 'if' clause is inverted: 'had I been informed' means 'if I had been informed', and it needs the past participle 'been' to make the passive 'had been informed'. The main clause takes a modal with the perfect infinitive: 'could have made'.
'Would have, being' breaks the 'if' clause: 'had I being informed' is not a verb form. 'Had, have' gives 'I had made arrangements had I have informed', which is ungrammatical and changes the meaning. 'Had been, been' gives 'I had been made arrangements', a passive that makes no sense with 'arrangements' as its object.
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