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Tom was about to close the window ________ his attention was caught by a bird.

Tom was about to close the window ______ his attention was caught by a bird.

 Tom was about to close the window_______ his attention was caught by a bird.

A. when             B. if                  C. and            D. till

 Tom was about to close the window ______ his attention was caught by a bird.

A. when          B. if                 C. and           D. till

Tom was about to close the window ____ his attention was caught by a bird.

A. when B. if C. and D. till