5. [A] Although [B] Lest [C] After [D] Unless [标准答案] [C] After [考点分析] 上下文语义 [选项分析] 根据下文“___a spouse has been selected, each family investigates the other…”可知,只有对象选择好后,父母才会去调查对方,显然表达的是时间先后顺序,所...