Tom was about to close the window his attention was caught by a bird.A. whenB. ifC. andD.

发布时间：2020-08-16 22:30:11

Tom was about to close the window      his attention was caught by a bird.
A. when
B. if
C. and
D. till

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(答案→)A. when
B. if
C. and
D. till
解析：考查固定搭配。be about to do sth. when...“正要做某事时，这时某事发生了”。句意“汤姆正要关窗户时，他的注意力被一只鸟吸引了。”故选A。
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