Reportedly, yesterday a group of American soldiers were walking along the road in Iraq when a bomb was , three of whom were killed.
A. set off
B. set out
C. set up
D. set about
网友回答
(答案→)A. set off
B. set out
C. set up
D. set about
解析：短语辨析。A引爆，引起，使发生；B出发；C建立；D出发。结合句意可知A正确。句意：据报道，当一个炸弹被引爆的时候，一群美国士兵正沿着路在行走，三人死亡。