简介： ppt制作 7. Tom was about to close the window _________ his attention was caught by a bird.

A. when B. if C. and D. till

【解析】考查连词。was caught是一般过去时，was about to表“过去将来”，故排除选项C和D。条件句也说不通，排除B。【答案】A。

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