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
考查非謂語動詞。根據(jù)后面的he saw.可知，C項時態(tài)不符合要求。While.部分作的是時間狀語，A，D項應(yīng)該為while he hunted  ，B，while hunting="while" he hunted
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