In an economy ________income per head us
题型：选择题
问题：
In an economy ________income per head used to rise by barely 1% a year, current growth rates feel like a miracle.
A．when
B．whose
C．that
D．where
In an economy ________income per head used to rise by barely 1% a year, current growth rates feel like a miracle.
A．when
B．whose
C．that
D．where