The sentence uses the Present Perfect with the past participle of 'know' (known) to describe a state that began in the past and continues up to the present.
A frase usa o Present Perfect com o particípio passado de 'know' (known) para descrever um estado que começou no passado e continua até ao presente.
| Front | She has --- (know) about this problem for three months. |
|---|---|
| Back | She has known about this problem for three months. |
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