Tom was about to close the window ______...

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

A．when

B．if

C．and

D．till

A 【解析】考察固定句型。Be about to do sth when…正要做某事，在这时…(发生了意料之外的事情)；故A正确。

考点分析：

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