In Lingua Latin per se Illustrata: Chapter 32, Line 158:
Sed frūstrā hoc optō, nam iam illī pīrātae eam spem mihi ēripient, idque eōdem diē quō ab amīcā meā dēsertus sum.
dēsertus sum seems to be the verb of the quō-clause (the same day in which I am deserted by my girlfriend), and where is the verb for the outer clause (which seems to have id as the subject)? Is it omitted?