公共英语二级
单选题How the fire in the dancing hall started＿＿＿a mystery．
参考答案：B进入在线模考
本题考查句子主谓一致。当主语是主语从句时，谓语动词要用单数。这句话的主语是“how the fire in the dancing hall started”，故选B。
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