Reportedly yesterday a group of American soldiers were walking along the road in Iraq when

问题补充：

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 up

D. set out

答案：

A. set about

(答案→)B. set off

C. set up

D. set out

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