问题
选择题
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
题目分析：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。