题文
______, the conference began.
| A．The candidates having taken their seats |
| B．The candidates had taken their seats |
| C．Taken their seats |
| D．Taking their seats |
推荐试卷
______, the conference began.
| A．The candidates having taken their seats |
| B．The candidates had taken their seats |
| C．Taken their seats |
| D．Taking their seats |
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