题目内容
Tom was about to close the window ______ his attention was caught by a bird.
A.when |
B.if |
C.and |
D.till |
【答案】
A
【解析】考察固定句型。Be about to do sth when…正要做某事,在这时…(发生了意料之外的事情);故A正确。
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