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
Random Topics:
Pronoun Antecedent AgreementPresent Perfect, Present Simple, Present ContinuousNarrative, Past TensesGrammar - Future ActionGerund and InfinitivesGrammar SuffixesAdverbs of frequencyVerb TensesAdjective Clause and Adverb ClauseHave to / Do not have toOther quiz:
Phrasal Verbs › ViewOur train leaves in an hour. It’s time to …
A. go back
B. set off
C. get back
D. pick up
Grammar, Literature, and Vocabulary › View
attempt, aspire, try
A. endeavor
B. imminent
C. profound
D. superficial
Conjunctions › ViewI didn’t get the job … I had all the necessary qualifications.
A. although
B. because
C. in spite of
D. despite
Past Simple and Past Continuous Tenses › View
Which tense is used to talk about specific actions that happened at a particular time in the past?
A. Future Continuous
B. Present Perfect
C. Past Continuous
D. Past Simple