when's someone knocked at the door, Jack was making a telephone call.这里面的when's
怎么解释啊,这个句子是不是错了啊
人气：141 ℃ 时间：2019-10-26 15:50:43
解答
当有人敲门的时候,JACK正在打电话.when后面's应该没有吧
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