问题
选择题
6．Be careful! The slightest spark（火花）could ______ the fireworks.
A．set about
B．set off
C．set out
D．set up
答案
答案：B
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6．Be careful! The slightest spark（火花）could ______ the fireworks.
A．set about
B．set off
C．set out
D．set up
答案：B
