11. The program is like a window on the world ______you sit by it and fix your attention on what it shows.A.if B.while D.as 表當----時還是別的？

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11. The program is like a window on the world ______you sit by it and fix your attention on what it shows.A.if B.while D.as 選B：當你坐在這程序前注視著它所顯示的，這個程序就像一個觀看世界的窗口。