—How long have you __________ here?
—For two days. I __________ here the day before yesterday.
A：been; came
B：come, came
C：came; came
D：come, was
春望
杜甫
国破山河在，城春草木深。感时花溅泪，恨别鸟惊心。
烽火连三月，家书抵万金。白头搔更短，浑欲不胜簪。
下列关于加速度的说法，其中正确的是（ ）
