问题标题:
3Wewereabouttoclimbuptothetopofthemountain________itbegantorWewereabouttoclimbuptothetopofthemountain_______itbegantorainheavily.A.asB.whileC.whenD.since
问题描述:

3Wewereabouttoclimbuptothetopofthemountain________itbegantor

Wewereabouttoclimbuptothetopofthemountain_______itbegantorainheavily.

A.asB.whileC.whenD.since

宋焱回答:
  Cbeaboutto...when...
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