第23题: [单项选择]Three weeks after the suicidal bombing, the police were still hunting for bombers for they believe more were ______. A. on the verge B. on the sly C. on the spot D. on the loose 参考答案:B 答案解析:on the sly偷偷地，暗地里；on the verge后跟of结构表示“在……的边缘”；on the spot当场，在现场；on the loose散漫，放荡。句意：自杀性爆炸三个星期之后，警方
