— Miss Liu, when did you come here?
— In 2015. I here for two years.
A:have been to
B:have gone to
C:have come
D:have been
若M=(2015﹣1985)2,O=(2015﹣1985)×(2014﹣1986),N=(2014﹣1986)2,则M+N﹣2O的值为____ .
下列有关区域的说法,正确的是( )