正方形的边长为2厘米,当边长增加3a厘米时,它的周长变为( )厘米.
8+12a
By the end of this year, another new museum_____in this small city.
A.had completed
B.will complete
C.has been completed
D.will have been completed
宝马车型常见分为几种车型?MINI除外。