he said “i will come back()two months.”为什么不可以填after

he said “i will come back()two months.”为什么不可以填after he will come back in two months 翻译The Greens will come back after two months I’m afraid it will be two months A.when I come back B.when I 1.he will come back (within two months)对打括号处提问. I will come back after two o'clock.这句话里的after能不能换成at?为什么?最好举 请说明原因He ---- for two months.I hope he will be back soon.A.ha 翻译The Greens will come back for two months He will be back after two hours it will be months before he can come back. he said,"i'll come back soon" They will come back（in）two days.为什么不用after?