【题目】Malaysia Airline Flight MH370 seemed to have been _______to only a mystery after so long and hopeless a search.
A. reduced B. formed
C. trapped D. absorbed
在线课程【答案】A
【解析】
试题分析：句意：在经过如此漫长而无望的搜寻后马来西亚航空公司的MH370航班慢慢地成了一个谜。A. reduced 减少，缩小； B. formed 形成； C. trapped困住； D. absorbed 吸收，全神贯注。.根据句意是“范围慢慢缩小为”故选A。