问题描述：
_____this kind of disease can cause great harm to the battle.
A.It occurs to where it is B.Occurring whereC.Where does it occur D.Where it occurs
为什么选D?Bn呢?
A.It occurs to where it is B.Occurring whereC.Where does it occur D.Where it occurs
为什么选D?Bn呢?
问题解答：
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