A recent study has found that the number of smokers ________ sharply over the past five years.
| A．is increasing |
| B．are increasing |
| C．has been increasing |
| D．have been increasing |
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A recent study has found that the number of smokers ________ sharply over the past five years.
| A．is increasing |
| B．are increasing |
| C．has been increasing |
| D．have been increasing |
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