单选题
It was not until one hundred thousand years after the big bang that photons were（ ）from matter.
问题1选项
A.set apart
B.set off
C.set out
D.set free
A.set apart
B.set off
C.set out
D.set free
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It was not until one hundred thousand years after the big bang that photons were（ ）from matter.
