Vous confondez ces mots?  Alors une petite révision s'impose.

Last = le précédent. I went to New-York City last week. (= la semaine dernière, la semaine précédente).

The last = le tout dernier.  I was the last man to get in.  They closed the doors behind me.

(Plus personne d'autre n'a pu entrer.  J'étais donc le tout dernier). 

Notez bien qu'au pluriel l'article défini 'the' disparait et il ne reste plus que 'last' ce qui complique encore un peu les choses.

(The) latest = le dernier en date. I've heard this in the latest news.

(Lors des dernières informations: celles de midi mais il y en aura d'autres ce soir.)

(The) Latter = le dernier des deux. She has 2 daughters.  The former is short and the latter is tall.

(La première est petite et la deuxième, la dernière des deux, est grande).

A vous de trouver le terme approprié.

Intermediate
English exercise "Last - Latter - Latest" created by gerard57 (04-09-2009) with The test builder
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1. I saw him last latest latter the last the latter week, 3 or 4 days ago.
2. The last latest latter the last the latter is the more expensive of these two books.
3. His last latest latter the last the latter novel was published yesterday and he's already thinking about his next book.
4. This is last latest latter the last the latter time I'm warning you!
5. Nelson's last latest latter the last the latter words were, "Thank God, I've done my duty".
6. I'm answering your last latest latter the last the latter letter and hope to be doing further business with you.
7. John married two women. The former was Italian, last latest latter the last the latter French.
8. I think last latest latter the last the latter time I saw her was last Monday.
9. I met her in 2000, in the last days of last latest latter the last the latter century.
10. They left at last latest latter the last the latter minute but managed to catch the plane on time.