They ought to have repaired the bridge long ago ?
a) They ought to have been repaired the bridge long ago
b) The bridge ought to have been repaired long ago
c) The bridge ought to have been repaired by them long ago.
d) The bridge ought to have been repaired long ago by them
The correct answer by them is option b, but why 'by them' is omitted
The agent is often omitted in passive voice, particularly if it is only specified vaguely as 'them'.
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The agent is often omitted in passive voice, particularly if it is only specified vaguely as 'them'.