Concept:The phrase “to find one’s feet” refers to becoming familiar and confident in a new situation.Explanation:The idiom “to find his feet” means to adjust and begin to cope successfully in a new environment.The sentence shows that since leaving home, he has been working towards settling into his new life.It does not mean suffering, losing shoes, or forgetting relatives.So the most appropriate interpretation is that he has been trying to get used to his new situation.Answer:D. has been trying to get used to his new situation