"to complete" vs "to have completed"

[audiolaik]

Hello,

The builders undertook to ..................... the whole job by the end of the week.

a) to complete
b) to have completed

I do agree that answer "a" is correct; all the same, what about answer "b".

Would it be a mistake if I chose it?

p.s. no context provided, sorry
_________________
Let the sound be with you!

[Mister Micawber]

.
I don't think B works-- at the time they undertook the job, the completion was clearly in the future.
.
_________________
Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mr. Micawber

[audiolaik]

What about the following:

...The builders undertook that they would have completed.....

Would it be correct?

Thanks!
_________________
Let the sound be with you!

[lxguy]

[Mister Micawber]

.
Even worse, in my estimation! Undertook that they would complete is OK.
.
_________________
Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mr. Micawber

[Yankee]