Malaysia Airlines Flight MH370 seemed to have been to only a mystery after so long and ho

问题补充：

Malaysia Airlines 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

答案：

(答案→)A. reduced

B. formed

C. trapped

D. absorbed

解析：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被困；D. absorbed吸引、全神贯注于。由句意可知选A。

考点: 考查动词的用法。