The present perfect tense is used to ask about an action that happened at an unspecified time in the past and has a relevant outcome. 'Have' is the correct auxiliary for the plural subject 'what things'.
La respuesta correcta es 'have'.
| Question | What … the boys done? | 
|---|---|
| Title | 887 | 
| QType (0=kprim,1=mc,2=sc) | 2 | 
| Q_1 | did | 
| Q_2 | were | 
| Q_3 | have | 
| Answers | 0 0 1 | 
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