He will be back in___.A one day or two B one or two days C a day or two days D one point five days 求大神解析下ABC三个的区别

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He will be back in___.A one day or two B one o
r two days C a day or two days D one point five days 求大神解析下ABC三个的区别

a day or two,one or two days 一两天
in +一段时间用在将来时态中