Understanding Aspect (simple, progressive, perfect)

Choose the correct verb form to complete the sentence.
Remember: The progressive aspect expresses an unfinished action and/ or an action that is temporary.
The perfect aspect expresses a connection between two time periods and can convey that one action or event took place before another.
For an action completed at one time or within a period of time, choose the simple present, the simple past, or the future with WILL or BE GOING TO.

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  1. I'm sorry. I _____ you. Can you say that again?
    1.   didn't hear
    2.   wasn't hearing
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