计量液体，如药水、饮料、牛奶等，用( ) 或( ) 作单位。
升, 毫升
螺旋式通货膨胀的原因是需求拉动造成的。（）
—You seem to have had that car for ages.
—Yes, I should sell it_________ it still can run.
A．before
B．after
C．until
D．while
