题目内容
5．Tom was about to close the windows_____his attention was caught by a bird．（ ）| A． | when | B． | if | C． | and | D． | till |
分析 句意：汤姆正要关窗户突然他的注意力被一只鸟吸引了．
解答 答案A．be about to do…when…正要做…突然．when作并列连词，相当于and at that time．根据句意：汤姆正要关窗户"突然"他的注意力被一只鸟吸引了．故选A．
点评 本题是基础题，考查从属连词，要掌握连词的用法并结合具体的语境选择出正确选项
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