簡介： 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】考查連詞。was caught是一般過去時，was about to表“過去將來”，故排除選項C和D。條件句也說不通，排除B�！敬鸢浮緼。

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