下列事件按时间先后顺序排列正确的是
①日本大化改新②希波战争③屋大维建立元首制④西罗马帝国灭亡[ ]
A.①②③④
B.③①④②
C.②③④①
D.④③①②
答案:C
In order to know those who really need help as well as how to help them, ________ to help others.
A.going
B.to go
C.gone
D.go
系统的调压措施有哪些?