选 B.in
in + 一段时间 表示一段时间后,而前面有 will.
所以选 B
on 加具体到某一天或某具体的早上/下午/晚上,如：on january 1st 或on Monday morning、on a warm morning
since 为 现在完成时 的时间状语,也就是有 since 句子就要用现在完成时
after+一段时间,表示 在 一段时间之后,但 after 表示以过去时间为起点的一段时间以后,因此通常与过去时连用.
in a few days for a few days
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