______ to smoking for a considerably long time, he has much difficulty quitting it.
| A．Having been addicted | B．Being addicted |
| C．To have been addicted | D．Having addicted |
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______ to smoking for a considerably long time, he has much difficulty quitting it.
| A．Having been addicted | B．Being addicted |
| C．To have been addicted | D．Having addicted |
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