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When ________ in Arctic regions, the Aleuts construct igloos as temporary winter shelters.


  1. A.
    travel
  2. B.
    to travel
  3. C.
    they traveling
  4. D.
    traveling
D
解析:
句子的主語和動詞travel構成主謂關系,應該用現在分詞,因此排除了A、B項,而C項they和traveling語法搭配不正確。分詞前面可以加上某些連詞,如:when, while, if, unless等。
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