Question

It __________ to rain when they _________ home.
a) was starting – walked
b) started – walked
c) started – were walking
d) started – was walking
e) were starting – walked

Answer 1

Letra C

It started to rain when they were walking home.

Começou a chover quando eles estavam caminhando para casa.

Answer 2

RESPOSTA 

- (Está correto), It started to rain when they were walking home. Eu estava respondendo outra questão e acabei confundindo com esta.

- No entanto, uma explicação sobre o exercício 

- When (quando) liga o passado contínuo com o passado simples.- - While (enquanto) liga o passado contínuo com o passado contínuo.

Ex: She was working when the telephone rang.
Ex: He was eating while I was reading the newspaper.