问题标题:
It'sdifficultforustoswima___theriverintwentyminntesThebuildingswereb___lastyearbytheworkers.
问题描述:

It'sdifficultforustoswima___theriverintwentyminntes

Thebuildingswereb___lastyearbytheworkers.

沈海澜回答:
  across   built,build的被动式
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