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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 huntingB.while hunting
C.while he huntD.while hunted
B
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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