The present perfect tense ('has been') is used to describe an event or situation that occurred in the past and has relevance to the present.
La respuesta correcta es 'has'.
| Question | This thing … been a crucial mistake. |
|---|---|
| Title | 825 |
| QType (0=kprim,1=mc,2=sc) | 2 |
| Q_1 | has |
| Q_2 | did |
| Q_3 | have |
| Answers | 1 0 0 |
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