Difference between wasn't and didn't

[duda]

Test No. incompl/elem-4 "Listen/Hear", question 1

I'm terribly sorry but I ......... what you said just now and I wonder if you could repeat it.

(a) wasn't listen to
(b) wasn't hearing
(c) didn't hear
(d) didn't hearing

Test No. incompl/elem-4 "Listen/Hear", answer 1

I'm terribly sorry but I didn't hear what you said just now and I wonder if you could repeat it.

Correct answer: (c) didn't hear
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Hai
please can you tell me the difference between didn't and wasn't? Thank you for your answer.

[Torsten]

Please take a look at these examples:

I didn't hear you.
This is Simple Past negative.

I wasn't listening to you.
This is Past Continuous negative.

For more information on the progressive tenses, please click here:
http://www.english-test.net/lessons/2/index.html
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