Question

A book is 3 They have completed the work​

Answer 1

Explanation:

ok then what's the question then

Answer 2

Explanation:

‘The work will have been completed (by them) by the time we get there.”

or,

“By the time we get there, the work will have been completed (by them).”

“by them” has been bracketed for the reason that in the passive, you may choose to omit it.