-- What a nice watch! How long you it?
-- For just two weeks.
A:will; buy
B:have; had
C:were; having
D:did; buy
若点P(x,y)在平面直角坐标系xOy中第四象限内的一点,且满足2x﹣y=4,x+y=m,则m的取值范围是____ .