Most lighthouses rhythmically flash ______ eclipse their lights to provide ...

[ Conjunctions ]

Most lighthouses rhythmically flash ______ eclipse their lights to provide an identification signal. The particular pattern of flashes ____ eclipses is known as the character of the light, _____ the interval at which it repeats itself is called the period.

A. or, or, and

B. but, or, and

C. and, and, or

D. or, and, but

Select your answer:
A B C D E

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