问题补充:
Tom was about to close the windows his attention was caught by a bird.
A. when
B. if
C. and
D. till
答案:
(答案→)A. when
B. if
C. and
D. till
解析:考查固定句型,句义:汤姆正要去关窗户,这是他的的注意力被一只鸟吸引了was /were about to do 。。。+when。。。。正要去做。。这是突然。。。,把握关键词was about to close,所以A正确。