Reportedly on April 15, 2013 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 |
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Reportedly on April 15, 2013 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 |
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