问题补充：
Reportedly on April 15, three people including a Chinese girl were killed in the Boston Marathon attacks when two bombs were , which shocked the whole world.
A. set about
B. set off
C. set up
D. set out
答案：
A. set about
(答案→)B. set off
C. set up
D. set out
解析：考查词组：A. set about出发B. set off引发，引爆C. set up建立D. set out出发，句意：据报道，4月15号，在波斯顿马拉松爆炸案中当炸弹引爆的时候，有三人包括一个中国女孩丧生，这件事震惊了全世界。选B。
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