How the fire in the dancing hall started ( )a mystery A.to remain B.remains C.remain D.is remaining

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How the fire in the dancing hall started ( )a mystery A.to remain B.remains C.remain D.is remaining
How the fire in the dancing hall started ( )a mystery
A.to remain B.remains C.remain D.is remaining

How the fire in the dancing hall started ( )a mystery A.to remain B.remains C.remain D.is remaining
主语是How the fire in the dancing hall started
这种东西还有那个动名词做主语,it等等都是单数

(How the fire in the dancing hall started )是主语,句子作主语用单数!