(1) Had the design been ready,we should have started working yesterday.
(2)Complicated though the problem is a computer can work it out in a few minutes.
(3) Not until it was dark did the manager leave his office.
(4)Off went the horse.
(1) Had the design been ready,we should have started working yesterday.
(2)Complicated though the problem is a computer can work it out in a few minutes.
(3) Not until it was dark did the manager leave his office.
(4)Off went the horse.
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