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(yǔ)和動(dòng)詞travel構(gòu)成主謂關(guān)系，應(yīng)該用現(xiàn)在分詞，因此排除了A、B項(xiàng)，而C項(xiàng)they和traveling語(yǔ)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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