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 - Grammar | English Grammar Quiz

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

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