Final answer:
The sentence 'Ellos tienen que su casa' translates to 'They have to______ their house'. The correct Spanish verb for 'to clean' is 'limpiar'
Step-by-step explanation:
The sentence 'Ellos tienen que su casa' translates to 'They have to______ their house' in English. In order to fill in the blank, we need to choose the correct Spanish verb that means 'to clean'. Among the given options, 'comprender', 'correr', 'vender', and 'prometer', the correct verb is 'comprender', which means 'to clean'. Therefore, the correct answer is 'limpiar'.
Learn more about Spanish Verbs