Resposta:
"He was my friend in the childhood" é a opção correta.
Explicação:
O past to be não se encaixa com as outras
Pra vc entender melhor:
Was: era - estava.
Were: era - estava.
I was
You were
He was
She was
It was
You were
We were
They were
Acima, está a forma correta de identificar/escrever as frases do jeito certo.
Espero ter ajudado!!!
