2. 外语
  3. Another factor in the display of art objects (concerns their continued preservation). Because of the sensitivity of some of the

Another factor in the display of art objects (concerns their continued preservation). Because of the sensitivity of some of the

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问题 Another factor in the display of art objects (concerns their continued preservation). Because of the sensitivity of some of the materials (used in their creation), it is necessary to control (within narrow limits) the temperature, humidity, and lighti
选项 A、concerns their continued preservation
B、used in their creation
C、within narrow limits
D、which
答案D
解析 (改为：to which)expose to为语组，引导定语从句时，to提前，用to which．
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