He _______ foreigners in his cafe before, so he didn’t know how to serve the American family.A.had rarely hadB.had had rarelyC.rarely hadD.had rarely
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A解析考查时态。由关键词before可知没有外国人来他的咖啡店发生在第二句之前，应该使用完成时。副词rarely要放在助动词和行为动词之间。句意：以前没有外国人来他的咖啡店，所以他不知道怎么给美国家庭提供服务。