单选题 The police succeeded in catching the ______ they were searching for within 48 hours.

【正确答案】 B
【答案解析】crime是名词“罪行”,criminal是名词“罪犯”,commitment是名词“犯罪,罪行”,commit是动词“犯罪”,这里指的是追捕罪犯,因此B正确。