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

C

【解析】

試題分析：考查固定句型和非謂語動詞。句意：因為光污染，星光太微弱了以至于在市區(qū)無法用肉眼看到(它們)。too...to...太......以至于......，stars和observe是動賓關(guān)系，即星星被觀察到，應(yīng)該用被動語態(tài)，故選C。

考點：考查固定句型和非謂語動詞

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