题目内容
【题目】Tom was about to close the windows_______ his attention was caught by a bird.
A. when B. if
C. and D. till
【答案】A
【解析】
试题分析：be about to do sth. when...结构，“正要做……这时……”的意思。句意：汤姆正要关窗，这时（忽然）一只鸟吸引了他的注意力。
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题目内容
【题目】Tom was about to close the windows_______ his attention was caught by a bird.
A. when B. if
C. and D. till
【答案】A
【解析】
试题分析：be about to do sth. when...结构，“正要做……这时……”的意思。句意：汤姆正要关窗，这时（忽然）一只鸟吸引了他的注意力。