2. 外语
  3. (travel) ______ by train is much cheaper than by air.

(travel) ______ by train is much cheaper than by air.

admin2011-01-09  29
问题 (travel) ______ by train is much cheaper than by air.
选项
答案Traveling
解析 本题考查非谓语动词。动名词可以作主语, 故travel应变成traveling。
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