One day a crow is

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looking 寻找.
======以下答案可供参考======
供参考答案1:
searching
search for找...
供参考答案2:
One day a crow was looking everywhere for some water.一天一只乌鸦正在到处找水。
is要改为was较好 One day表示过去
供参考答案3:
looking for
供参考答案4:
looking.
looking for
是个固定搭配，意思为寻找。