Question

Mr. Green will be back______ A. in three hour's time B. after three o'lock C. three hours later

Mr. Green will be back______
A. in three hour's time B. after three o'lock C. three hours later

Answer 1

选B after three o'clock Green先生会在3点之后回来
A错，应为in three hours
C错，时间段+later不能用于将来时态，只能用于过去时态。比如说 He went out at 8 a.m. and came back three hours later.

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Answer 2

应该是C，A应该是in three hours' time B的意思不明确，不知道是三点以后还是三小时以后