Though it was already late March ,it ____cold.A.remained B.remains C.remaining D.remain我想知道为什么?为什么不能选B呢?

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Though it was already late March ,it ____cold.A.remained B.remains C.remaining D.remain我想知道为什么?为什么不能选B呢?

Though it was already late March ,it ____cold.A.remained B.remains C.remaining D.remain我想知道为什么?为什么不能选B呢?
Though it was already late March ,it ____cold.A.remained B.remains C.remaining D.remain
我想知道为什么?为什么不能选B呢?

Though it was already late March ,it ____cold.A.remained B.remains C.remaining D.remain我想知道为什么?为什么不能选B呢?
为了保持时态的一致性,前面是过去时,后一句也要用过去时.