—I joined the League May, 2012. What about you?
—I’ve been a League member three years.
| A．in； for | B．on； in |
| C．in； since | D．on； for |
—I joined the League May, 2012. What about you?
—I’ve been a League member three years.
| A．in； for | B．on； in |
| C．in； since | D．on； for |
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