The present perfect tense is used to ask about a past event that has a present consequence or relevance. 'Has' is the correct auxiliary for the singular subject 'what'.
La respuesta correcta es 'has'.
| Question | What … happened? | 
|---|---|
| Title | 877 | 
| QType (0=kprim,1=mc,2=sc) | 2 | 
| Q_1 | did | 
| Q_2 | has | 
| Q_3 | wa s | 
| Answers | 0 1 0 | 
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