____ I met Nelson Mandela was a very difficult period of my life.
| A．The first time | B．The first time when |
| C．For the first time | D．That was the first time |
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____ I met Nelson Mandela was a very difficult period of my life.
| A．The first time | B．The first time when |
| C．For the first time | D．That was the first time |
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