bonjour pouvez-vous m’aider j’ai des exercices ci-dessous que je n’arrive pas à comprendre merci bien

A. When Jimmy signed his first contract with a Hollywood studio he had never acted in a film.
B. By the age of 28 both Carrie and Sue had tried six different jobs in three different countries.

C. Molly had acted in one only TV Series when she got the leading role in a big production.

Ex 2
a) he had emigrated / He did
b) had gotten / he was
c) he had met / he had already acted / became
d) he had made / stopped / left / went