Complete the sentence-comment clause with a five-word fragment: The supplier cut the delivery time, ___. Use which, saved, us, two, and days in that order, with no added words.
Bonne réponse
which saved us two days
Explication
Which takes the entire preceding event as its antecedent, and saved states the consequence of that event. That would be the closest distractor, but it cannot introduce this parenthetical comment on a complete clause.