问题
选择题
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
答案
答案：A
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。