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题目内容
（安徽广播电视大学-机电一体化技术）
A group of American soldiers were walking along the road in Irap when a bomb was _____, three of whom were killed.
A、set about
B、set out
C、set up
D、set off
A、set about
B、set out
C、set up
D、set off
参考答案
