2. 自考
  3. It was not until one hundred thousand years after the big bang that photons were______from matter.

It was not until one hundred thousand years after the big bang that photons were______from matter.

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问题 It was not until one hundred thousand years after the big bang that photons were______from matter.
选项 A、set apart
B、set off
C、set free
D、set out
答案C
解析
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