It was reported that many helicopters were sent there the missing passengers.
A. in search of
B. in need of
C. in charge of
D. in time of
网友回答
(答案→)A. in search of
B. in need of
C. in charge of
D. in time of
解析：考查词组：A. in search of寻找B. in need of需要C. in charge of负责D. in time of在…时候，句意是：据报道很多直升飞机被派到那里去寻找失踪的乘客。选A。