问题
The incident _____ a chain of events which resulted in the outbreak of the World War I. width=”228″ valign=”top” style=”width:171.0pt;padding:0cm 5.4pt 0cm 5.4pt”
A: set out
B: set off
C:set about
D: set in
B: set off
C:set about
D: set in
正确答案是：
