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【题目】Due to the light pollution, stars are too faint _________with naked eyes in the urban area.

A. observing B. being observed

C. to be observed D. to be observing

【答案】C

【解析】

试题分析:考查固定句型和非谓语动词。句意:因为光污染,星光太微弱了以至于在市区无法用肉眼看到(它们)。too...to...太......以至于......,stars和observe是动宾关系,即星星被观察到,应该用被动语态,故选C。

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