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The program is like a window on the world ____ you sit by it and fix your attention on what it shows.

A、if         B、as       C、while D、unless

The program is like a window on the world ____ you sit by it and fix your attention on what it shows.

A、if   B、as   C、while    D、unless

The program is like a window on the world ____ you sit by it and fix your attention on what it shows.

    A. if     B. as     C. while     D. unless

The program is like a window on the world ____ you sit by it and fix your attention on what it shows.

A、if B、as C、while　 D、unless

The program is like a window on the world ____ you sit by it and fix your attention on what it shows.

A、if B、as C、while D、unless