[ Grammar ]
The sun was thought _____ a ball of fire in the past, but now it is known _____ a glowing sphere of gases.
A. to have been, to have been
B. to had been, to be
C. to be, to have been
D. to be, to be
Random Topics:
Grammar & VocabularySimple Past Irregular & NegativeSentence Structure and PunctuationPresent and Future TensesModal Verbs and Gender NounsIrregular verbsTenses and Figurative LanguagePresent Perfect and Present Perfect ContinuousComparison DegreeEmployment VocabularyOther quiz:
Vocabulary › ViewWhat does “emit” mean?
A. To hide something
B. To give off or send out
C. To break something
D. To collect something
Simple Past Continuos › View
As I _____ in the streets of Holland, I ____ an old friend of mine.
A. walked – met
B. was walking – met
C. was walking – was meeting
D. walked – was meeting