应该是when seeing
to see表示还没发生,这里是已经看到他妈妈了,然后很高兴
He was happy when he saw his mother.改为同义句He was happy ______his mother
He was happy when he saw his mother.改为同义句He was happy ______his mother
英语人气：874 ℃时间：2019-08-21 13:15:19
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