How the fire in the dancing hall started ______ a mystery.A、to remainB、remains

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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

解析本题测试的是主渭一致。当主语是从句的时候，谓语动词要用单数。例如：Who is her father is not known. (谁是她的父亲尚不得知。)

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