after 还是 inMr.White will come back (in) three days.为什么正确答案是 in?

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after 还是 inMr.White will come back (in) three days.为什么正确答案是 in?
after 还是 in
Mr.White will come back (in) three days.为什么正确答案是 in?

after 还是 inMr.White will come back (in) three days.为什么正确答案是 in?
将来时里,表示一段时间之后只能用介词in.
三天后我要去上海
I will go to Shanghai in 3 days （正确)
I will go to Shanghai 3 days later (错误）
我打算3年后结婚.
I plan to get married three years later.(一般现在时）
I'm going to get married in three years.（一般将来时）
Three days later he got to Beijing．＝After three days he got to Beijing．
他三天以后到达了北京.
这两个句子都是对的,一般过去时态两个都可以用.
请采纳答案,支持我一下.

指他会在三天内回来

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