until 前面可不可以用was doing 为什么用his father was sitting in the sof
until 前面可不可以用was doing 为什么用his father was sitting in the sofa when he came in 而不用 为什么用his father was sitting in the sofa when he came in 而不用his father was sitting in the sofa until he came in
先来段解释: ①介词 prep. 1.直到...时,到...为止 Will this fish keep until tomorrow? 这鱼能搁到明天吗? 2.(用于否定句)在...之前,直到...(才) She didn't go to bed until eleven o'clock. 她直到十一点才上床睡觉。 ②连接...