The program is like a window on the world ____ you sit by it and fix your attention on what it shows.
A．ifB．a(chǎn)sC．whileD．unless
A
本題主要考查對句子間邏輯關(guān)系的理解。選項A表示條件；選項B表示時間或原因；選項C表示時間；選項D表示否定意義的條件。根據(jù)句子的邏輯關(guān)系，答案為A。
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