Sequence of tenses: Choose the correct form for the clause with "when". Original sentence: "We were still standing in the queue when the film was beginning." Select the best correction.

Given data

• Ongoing past action: "were still standing".
• Reference point: start of the film happened earlier.

Concept/Approach
Use past perfect to show an earlier completed past event relative to another past action: had + past participle.

Step-by-step
Change "was beginning" to "had begun" to mark anteriority.Corrected: "We were still standing in the queue when the film had begun."

Option analysis
B is correct for anterior past; A (simple past) is possible in some narratives, but the question targets clear sequence marking; C/D are incorrect; E leaves a tense mismatch.

Common pitfalls
Using a progressive for a punctual starting point ("was beginning").

Final Answer
film had begun