题文
Three million tons of coal ______ every year in the city.
| A．is exploited |
| B．are exploited |
| C．had exploited |
| D．have exploited |
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Three million tons of coal ______ every year in the city.
| A．is exploited |
| B．are exploited |
| C．had exploited |
| D．have exploited |
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