问题
选择题
Do be careful with those fireworks. The slightest spark could _____ them _____.[ ]
A. set; out
B. set; off
C. set; up
D. set; down
答案
答案：B
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Do be careful with those fireworks. The slightest spark could _____ them _____.[ ]
A. set; out
B. set; off
C. set; up
D. set; down
答案：B