2. 专升本
  3. ______ arriving at the spot, the policemen at once helped the passengers to safety.

______ arriving at the spot, the policemen at once helped the passengers to safety.

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问题 ______ arriving at the spot, the policemen at once helped the passengers to safety.
选项 A、At
B、On
C、The moment
D、As
答案B
解析
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