One winter day , he saw the tracks of animals in the snow and observed that the appearance

发布时间：2020-08-16 21:00:51

One winter day     , he saw the tracks of animals in the snow and observed that the appearance of each one was different.
A. while he hunting
B. while hunting
C. while he hunt
D. while hunted

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A. while he hunting
(答案→)B. while hunting
C. while he hunt
D. while hunted
解析：考查非谓语动词。根据后面的he saw.可知，C项时态不符合要求。While.部分作的是时间状语，A，D项应该为while he hunted  ，B，while hunting=while he hunted
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