Let's go home .It's 5 o'clock and it's getting dark.A on B in C or D around

问题描述:

Let's go home .It's 5 o'clock and it's getting dark.A on B in C or D around
空在“5”前面.

空在5前面的话应该是D,具体时刻前面不加介词的,around 表示大约,也可以替换成about