It is pretty well understood today ___ causes thechange of our body temperature.
问题描述：
It is pretty well understood today ___ causes thechange of our body temperature.
A.whatB.that whatC.thatD.how
请写出为什么,并翻译一下句子谢谢!
答
A
在今天我们很容易理解是什么导致我们体温的变化