Final answer:
The best translation is 'Il n'y a pas d'horloge dans la salle de classe'.
Step-by-step explanation:
The best translation of the sentence 'There is no clock in the classroom' is: Il n'y a pas d'horloge dans la salle de classe.
In this translation, 'Il n'y a' means 'There is/are not', 'pas' means 'no/not', 'd'horloge' means 'clock', and 'dans la salle de classe' means 'in the classroom'.
Therefore, the correct translation is: Il n'y a pas d'horloge dans la salle de classe.
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