a = can't
b = should have
c= must have
d= couldn't have
e= must have
Cara Júlia,
Aí vão as respostas corretas do seu exercício:
a) can't have
b) might have
c) should have
d) couldn't have
e) must have
Espero ter ajudado.
a) can't have
b) might have
c) should have
d) couldn't have
e) must have
Vejo que sua dúvida já foi respondida. Caso queira ou precise de aulas focadas em conversação, entre no meu perfil.