It was such a to have spent a day with the local family.
A. privilege
B. concept
C. qualification
D. requirement
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(答案→)A. privilege
B. concept
C. qualification
D. requirement
解析：考察名词词义辨析。A特权，权力；B概念；C资格；D要求；句意：和当地人的家庭在一起度过一天的时间是多么好的特权啊！本句是指这是很难做到的事情。根据句意说明A正确。