— Do you know something about Kwanzaa? — It is _____festival celebrating the culture and history of African Americans.A.a seven-dayB.a seven-daysC.a seven dayD.seven days
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A解析本题考查复合形容词的用法。seven-day是复合形容词，作定语的复合形容词中的名词要用单数形式。a seven-day festival“一个七天的节日”。）