Tom was about to close the window ______

问题选择题

Tom was about to close the window ________ his attention was caught by a bird.

A．when

B．if

C．and

D．till

答案

答案：A

考查固定搭配。be about to do sth. when...“正要做某事时，这时某事发生了”。句意“汤姆正要关窗户时，他的注意力被一只鸟吸引了。”故选A。