问题
选择题
Tom was about to close the window ___ his attention was caught by a bird.
A．when
B．if
C．and
D．till
答案
答案：A
固定句型。Be about to do sth when…正要做某事…在这时…
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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
固定句型。Be about to do sth when…正要做某事…在这时…