问题补充：
The firemen arrived the fire broke out.
A. soon after
B. before long
C. long before
D. after soon
答案：
(答案→)A. soon after
B. before long
C. long before
D. after soon
解析：soon after意思为：不久；before long意思：不久之后, 在短时间内； long before很久以前。固定短语
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