问题标题:
【ThesecollegestudentsspentawholemonthtravelinginNorthwestChina,whichgreatly____theirvisionandknowledge.请问括号里填broad的什么形式?】
问题描述:

ThesecollegestudentsspentawholemonthtravelinginNorthwestChina,whichgreatly____theirvisionandknowledge.请问括号里填broad的什么形式?

陶仲林回答:
  ThesecollegestudentsspentawholemonthtravelinginNorthwestChina,whichgreatly__broadened__theirvisionandknowledge.这里填broad的过去式.
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