Question

I returned home_the bus had started ​

Answer 1

Answer:

I returned home as soon as the bus started.

or

I returned home when the bus started.

Answer 2

I returned home before the bus had started.

Explanation:

• The given sentence is an assertive sentence.  It asserts a specific time and correlates two time periods.

• The subject of the sentence is 'I'.  The subject asserts a time period that is correlated to the subject's returning.  

• The blank has thus to be filled in with an adverb of time.  The most appropriate adverb of time to be used here is 'before'.

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