题目内容
【题目】Tom was about to close the window __________ his attention was caught by a bird.
A. when
B. if
C. and
D. till
【答案】A
【解析】句意:汤姆正要关上窗户,就在那时一只鸟引起了他的注意。在句式“. . . be about to do sth. when. . . ”中,when作并列连词,相当于and just then,句中was about to do为标志词,故答案为A项。
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