he will be back__two days.A in B after C on D for怎么选?与么区别?

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hewillbeback__twodays.AinBafterConDfor怎么选?与么区别?hewillbeback__twodays.AinBafterConDfor怎么选?与么区别?hewill

he will be back__two days.A in B after C on D for怎么选?与么区别?
he will be back__two days.
A in B after C on D for
怎么选?与么区别?

he will be back__two days.A in B after C on D for怎么选?与么区别?
A
in表示在某一段时间内,如果要表示在两天后也不能选B,而应该用he will be back two days later.

in
因为是will be back,是将来时,in two days就表示两天以后。
基本上看到将来时都用in引导时间。

A 他将在两天内回来