The present perfect tense is used to describe a completed action in the past that has relevance to the present. 'Has' is the correct auxiliary verb for the singular subject 'One of our clients'.
La respuesta correcta es 'has'.
| Question | One of our clients … refused to pay. | 
|---|---|
| Title | 828 | 
| QType (0=kprim,1=mc,2=sc) | 2 | 
| Q_1 | was | 
| Q_2 | has | 
| Q_3 | have | 
| Answers | 0 1 0 | 
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