精品一区二区免费在线观看_国产精品久久久久久av福利软件_97成人精品区在线播放_国内成人精品一区

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