Fill in the blanks with the most appropriate option. 

When we went to the cinema, the film _________________

Option a: "already started" it is in the past. So that's not right.

Option b: "had already started" is in the past perfect. This is the action mode you want. This is the past tense, in which "had" was followed by a past tense verb. This is the correct answer.

Option c: "would already start" next season. That is the wrong choice.

Option d: If none of the above options are correct or do not match the stated statement, check this option. But in our question, this option is incorrect because we have already received an answer