就填cross
因为这里有often,表示汤姆的妈妈经常看到汤姆走过街道的全过程,所以用see sb.do sth.
至于see sb doing sth,则表示看到某人正在做某事,就是要有一个时间点,例如说at 8 o'clock
用所给词的正确形式填空 Tom's mother often _____(cross) the street.
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