英语单选题

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 表当----时还是别的？

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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 选B：当你坐在这程序前注视着它所显示的，这个程序就像一个观看世界的窗口。