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

A.ifB.asC.whileD.unless

【答案】A

【解析】

句意:如果你坐在一旁集中注意静观它所展示的东西,你会发现这个程序就像世界的一扇窗户。

考查连词。 if如果,表条件;as如同;while当……时候,表时间;unless除非;根据题意可知后面半句是前面半句的条件,如果这么做才会能体会到这个程序像世界的窗户,用if。故选A

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