题目内容
【题目】I was about to leave __________ someone knocked at the door.
A. when
B. while
C. since
D. once
【答案】A
【解析】句意:我正要离开,这时有人敲门了。be about to do. . . when. . . 表示“正要干……这时……”。
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题目内容
【题目】I was about to leave __________ someone knocked at the door.
A. when
B. while
C. since
D. once
【答案】A
【解析】句意:我正要离开,这时有人敲门了。be about to do. . . when. . . 表示“正要干……这时……”。