Question

If only he_______ informed us beforehand, none of this confusion would have happened.
a) has
b) had
c) have been
d) had been

Answer 1

Answer:

have been

Hope it's help you

Answer 2

Answer:

(b) Had

$\bf{\blue{If\: only\: he \:had \:informed\: us \:beforehand, \:none \:of \:this \:confusion\: would\: have\: happened.}}$