适当形式填空:While ___(climb) up the hill,the old man often sat down and had a rest.

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适当形式填空:While ___(climb) up the hill,the old man often sat down and had a rest.
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适当形式填空:While ___(climb) up the hill,the old man often sat down and had a rest.
适当形式填空:While ___(climb) up the hill,the old man often sat down and had a rest.

适当形式填空:While ___(climb) up the hill,the old man often sat down and had a rest.
climbing=While he was climbing up the hill,
在爬山的时候,那位老人经常坐下来休息一下.

While 【climbing】(climb) up the hill,the old man often sat down and had a rest.