He didnt leave until we came back 改同义句He didnt leave until we came back.（改为同义句）He —— —— we came back.
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Hedidntleaveuntilwecameback改同义句Hedidntleaveuntilwecameback.（改为同义句）He————wecameback.Hedidntleaveuntil
He didnt leave until we came back 改同义句He didnt leave until we came back.（改为同义句）He —— —— we came back.
He didnt leave until we came back 改同义句
He didnt leave until we came back.（改为同义句）
He —— —— we came back.
He didnt leave until we came back 改同义句He didnt leave until we came back.（改为同义句）He —— —— we came back.
stayed till 或 left when
left after