Fill in the blank:
Had I known the conference was postponed, I ______ my flight reservations.
Show answer & explanation
Correct answer: B
Explanation
The sentence is: “Had I known the conference was postponed…”
This is a third conditional (past unreal situation).
Structure of third conditional: If + past perfect → would have + V³
So:
Had I known… (= If I had known…)
I would have canceled my flight reservations.
Why others are wrong:
A) would cancel → present/future condition
C) will have canceled → future perfect
D) had canceled → incorrect structure here