题目内容
【题目】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 about B.set off
C.set free D.set out
【答案】B
【解析】选B。考查set短语的用法。set about着手,开始;set off出发,动身;引爆;燃放;set free释放;set out动身,出发;着手,开始。由题意知选B项。
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