问题补充：
that all mountain roads were closed.
A. So became the dangerous weather
B. So dangerous did the weather become
C. So dangerous became the weather
D. Dangerous the weather became so
答案：
A. So became the dangerous weather
(答案→)B. So dangerous did the weather become
C. So dangerous became the weather
D. Dangerous the weather became so
解析：考查So后有形容词或副词且位于句首时，应使用部分倒装形式。
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