The simple past tense is used to describe a completed action in the past. 'Didn't' is the auxiliary verb for the simple past negative of most verbs.
La respuesta correcta es 'didn’t'.
| Question | Our teachers … modified the course. | 
|---|---|
| Title | 848 | 
| QType (0=kprim,1=mc,2=sc) | 2 | 
| Q_1 | haven’t | 
| Q_2 | didn’t | 
| Q_3 | weren’t | 
| Answers | 1 0 0 | 
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