The correct verb in Infinitive Form to fill the sentence is:
- Ellos tienen que vender su casa.
Choice of the correct verb.
To select the correct verb, since all the verbs are in the infinitive and apparently could be used in a sentence like this, you must pay attention to the context of the sentence, in which it is narrated about doing something with a house, for which, the only verb that can be used in such a sentence is "vender."
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