The quantum theory states ______, such as light, is given off and absorbed in tiny definite units called quanta or photons.

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问题 The quantum theory states ______, such as light, is given off and absorbed in tiny definite units called quanta or photons.

选项 A、energy that
B、that it is energy
C、it is energy
D、that energy

答案D

解析 that引导宾语从句。
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