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Vitamin D gets produced when animals are exposed to direct sunlight, for_reason, it

is always advisable to give them chances to spend time in the sun.

A. whose  B. that  

C. which  D. its

 

C

【解析】

试题分析:考查定语从句。句意:当动物直接接触阳光时维生素D 就会产生,因为这个原因,给他们适合的时间去晒太阳是非常明智的。Which代指上面这个原因,故选C项。

考点 : 考查定语从句

 

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