Question

the workers have called off the strike change into passive voice

Answer 1

The strike has been called off by the workers

Answer 2

$\bold\green{\boxed{\boxed{Answer : \longrightarrow}}}$

$\bold{The \: \: strike \: \: has \: \: been \: \: called \: \: off}$
$\bold{by \: \: the \: \: workers.}$