题文
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 |
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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 |
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