Answer:
Transitive.
Step-by-step explanation:
A transitive sentence is one that has a direct object different from the subject of the sentence, that is, in which the verb exercises its action. Thus, in the case, someone must leave and leave another person alone, with which that first person, who must leave, and the second, who must be left alone, are two different entities, with which the verb is transmitted from the subject towards the direct object.