问题
选择题
Tom ______ close the window when his attention was caught by a bird.
A．was to
B．went
C．was about to
D．would
答案
答案：C
考查固定句型：be about to do … when，即将做某事，正在那时，句意：汤姆刚要关上窗户正在那时他被一只鸟引起了他的注意。故选C。
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