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

发布时间：2020-08-16 21:08:04

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：固定句型。Be about to do sth when…正要做某事…在这时…
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