He was happy when he saw his mother.改为同义句He was happy ___ ___his mother

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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

He was happy when he saw his mother.改为同义句He was happy ___ ___his mother
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

to see

He was happy when he saw his mother.
=He was happy to see his mother.

to see

to see

to see