It was decided to the search when there was no hope of finding the missing child alive.
A. call off
B. let off
C. put off
D. round off
网友回答
(答案→)A. call off
B. let off
C. put off
D. round off
解析：短语辨析。A.取消 B. 宽恕 C. 推迟 D.完成。句意：当没有希望找到这个失踪的孩子还活着的时候，决定取消搜查。故选A。