How the fire in the dancing hall started ______ a mystery.

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问题 How the fire in the dancing hall started ______ a mystery.

选项 A、to remain
B、remains
C、remain
D、is remaining

答案B

解析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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