Sometimes lights are（）by fog，haze，dust，smoke，or precipi

单项选择题

Sometimes lights are（）by fog，haze，dust，smoke，or precipitation which may be present at the light，or between the light and the observer，and which is possibly unknown by the observer.

A.obscured
B.darkened
C.greyed
D.delighted

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锚泊与靠离泊作业