Identify the sentence that uses the past progressive tense correctly.

a. i was sleeping soundly when the doorbell rang.
b.
my little brother is playing shortstop in a little league game.
c.
yang will be cooking dinner before her out-of-town guests arrive tonight.
d.
lisa and abdul had agreed on a movie before they went out to dinner.

A. I was sleeping soundly when the doorbell rang.

Explanation:

Past progressive tense is a form of past tense which indicates the actions that was going on or was happening at a point in the past. The formation of past progressive tense is:

Subject + was/were + past participle of the main verb + -ing + object.

Past progressive action takes place when something was already going in simple past. It indicates a limited duration of the period.

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