单选题
Only after ______ requests by the tenants did the superintendant do something about the broken intercoms in some of the apartments.
【正确答案】
B
【答案解析】横线处所填单词修饰名词requests。过去分词(B)repeated和现在分词(C)repeating都可用作形容词。被修饰的名词和分词之间如果是被动关系，就用过去分词；如果是主动关系，则用现在分词。requests和repeat是被动关系，故选择过去分词(B)repeated。