Question

【题目】Tom was about to close the windows_______ his attention was caught by a bird.

A. when B. if

C. and D. till

Answer 1

【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。