The pupils___busily when Mr Brown went to get a book he___in the office
| A．had written;left |
| B．were writing;has left |
| C．had written;had left |
| D．were writing;had left |
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The pupils___busily when Mr Brown went to get a book he___in the office
| A．had written;left |
| B．were writing;has left |
| C．had written;had left |
| D．were writing;had left |
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