[ 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 be, to have been
C. to have been, to be
D. to be, to be
Select your answer:
Random Topics:
ConnectorsVerbs and PrepositionsMixed ConditionalsFormal & Informal WordsActive & PassiveParts of Speech and GrammarSimple Past Tense & Future TenseSimple vs Present Continuous TensesPassive with ModalsOther quiz:
Homonyms › ViewIf you do not wash your skin properly the ___ will become clogged.
a. pores
b. pours
Superlative & Comparative Adverbs › View
He arrived __________ than expected. (early)
A. earliest
B. earlier
C. more early
D. most early