It was decided to______ the search when there was no hope of finding the missing girl.
【正确答案】 A
【答案解析】解析：本题考查词组辨析。call off(=cancel)，取消；take up，占据；keep off，不接近；ring up，打电话。因为没有希望找到，所以应该是不再找了，选call off。